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Screenshot of the answers to C language exercises
2022-06-26 16:36:00 【TUSTer_】
One dimensional array and two dimensional array
The first 1 Turn off Scheduling problem
#include<stdio.h>
int main()
{
/*********Begin*********/
int a[10];
int i,j,t;
printf("\n");
for (i=0;i<10;i++) scanf("%d",&a[i]);
printf("\n");
for (j=0;j<9;j++)
for(i=0;i<9-j;i++)
if(a[i]>a[i+1])
{
t=a[i];a[i]=a[i+1];a[i+1]=t;
}
printf("\n");
for(i=9;i>=0;i--) printf("%d ",a[i]);
printf("\n");
return 0;
}The first 2 Turn off Look up integers
#include<stdio.h>
int a[1009];
int main()
{
int n;
scanf("%d", &n);
for(int i = 1; i <= n; i ++)
scanf("%d", &a[i]);
int pre;
scanf("%d", &pre);
for(int i = 1; i <= n; i ++)
{
if(a[i] == pre)
{
printf("%d", i);
return 0;
}
}
printf("-1");
return 0;
}
The first 3 Turn off Calculate the maximum value of the element in the array and its row and column subscript value
#include<stdio.h>
int a[1000][1000];
int main()
{
printf("Input m, n:");
int n, m;
scanf("%d,%d", &n, &m);
printf("Input %d*%d array:\n", n , m);
for(int i = 1; i <= n; i ++)
for(int j = 1; j <= m; j ++)
scanf("%d", &a[i][j]);
int MAX = -999999;
int r, c;
for(int i = 1; i <= n; i ++)
for(int j = 1; j <= m; j ++)
if(a[i][j] > MAX)
{
MAX = a[i][j];
r = i;
c = j;
}
printf("max=%d, row=%d, col=%d", MAX, r, c);
return 0;
}
The first 4 Turn off Delete maximum
#include<stdio.h>
int main()
{
int a[10];
int MAX = -1;
for(int i = 0; i < 10; i ++)
scanf("%d", &a[i]);
for(int i = 0; i < 10; i ++)
{
if(a[i] > MAX) MAX = a[i];
}
for(int i = 0; i < 10; i ++)
{
if(a[i] == MAX) continue;
printf("%d ", a[i]);
}
return 0;
}
The first 5 Turn off Yang hui triangle
#include<stdio.h>
int a[10][10];
int main()
{
int num = 1;
for(int i = 0; i < 10; i ++) a[i][0] = 1;
for(int i = 1; i < 10; i ++)
{
for(int j = 1; j < 10; j ++)
{
if(j == num)
{
num ++;
a[i][j] = 1;
break;
}
a[i][j] = a[i - 1][j - 1] + a[i - 1][j];
}
}
num = 1;
for(int i = 0; i < 10; i ++)
{
for(int j = 0; j < 10; j ++)
{
if(j == num)
{
num ++;
break;
}
if(j == num - 1) printf("%d", a[i][j]);
else printf("%d ", a[i][j]);
}
printf("\n");
}
return 0;
}
The use of three loop statements
The first 1 Turn off Fractional sequence and
#include <stdio.h>
int main( )
{
int a, b, c, k, n = 5;
double s;
s = 0.0; a = 2; b = 1;
for ( k = 1; k <= n; k++ )
{
/***** There is an error in the following line *****/
s = s + (double)a / (double)b;
/***** There is an error in the following line *****/
c=a;a=b+c;b=c;
}
printf( "s%d = %lf\n", n, s);
return 0;
}The first 2 Turn off Formula calculation （1）
#include<stdio.h>
int main()
{
int n,a=0;
double s;
scanf("%d",&n);
for(int i=1;i<=n;i++)
{
a=a+i;
s=s+1/(double)a;
}
printf("s = %lf",s);
return 0;
}The first 3 Turn off Formula calculation （2）
/********** Begin **********/
#include<stdio.h>
#include<math.h>
int main()
{
int m;
scanf("%d",&m);
double log(double x);
double s=0;
for(double i=1;i<=m;i++)
{
s=s+log(i);
}
s=sqrt(s);
printf("s = %lf",s);
return 0;
}
The first 4 Turn off Ask to be at the same time 7 or 11 Integers divided by integers
/********** Begin **********/
#include<stdio.h>
int main()
{
int x;
for(int i=1;i<=1000;i++)
{
if (i%7==0||i%11==0)
{
if(i%7==0&&i%11==0)
{
}
else
{
x++;
printf("%-5d",i);
}
}
if(x==8)
{
printf("\n");
x=0;
}
}
return 0;
}The first 5 Turn off Formula calculation （3）
/********** Begin **********/
#include<stdio.h>
int main()
{
int n;
double s=1,sum=1;
scanf("%d",&n);
for(int i=1;i<=n;i++)
{
sum=sum*i;
s=s+1/sum;
}
printf("s = %.6lf",s);
return 0;
}Cyclic structure programming 1
The first 1 Turn off Small ball free fall movement
#include<stdio.h>
#include<math.h>
int main(void)
{
/*********Begin*********/
float M,N,sum,high,x;
scanf("%f",&M);
scanf("%f",&N);
int i;
sum=M;
for (i=1;i<N;i++)
{
high=pow(0.5,i)*M;
x=pow(0.5,i)*M;
sum=sum+high+x;
}
high=pow(0.5,N)*M;
sum=sum;
printf("%.2f %.2f",high,sum);
/*********End**********/
return 0;
}
The first 2 Turn off Find out n All can be 5 The product of positive integers divided by integers
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int N ,i,sum=1;
scanf("%d",&N);
for(i=1;i<=N;i++)
{
if(i%5==0)
{
sum=sum*i;
}
}
printf("%d",sum);
/*********End**********/
return 0;
}The first 3 Turn off The greatest common divisor and the least common multiple
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int a,b,c,m,t;
scanf("%d%d",&a,&b);
if(a,b)
{
t=a;a=b;
b=t;
}
m=a*b;
c=a%b;
while(c!=0)
{
a=b;
b=c;
c=a%b;
}
printf(" The greatest common divisor is :%d\n",b);
printf(" The minimum common multiple is :%d",m/b);
/*********End**********/
return 0;
}The first 4 Turn off Statistics of the number of various characters in the string
#include<stdio.h>
int main(void)
{
/*********Begin*********/
char m;
int a=1;
int k=0,s=0,e=0,n=0;
while(a)
{
m=getchar();
if(m==' ')
k+=1;
else if((m>='a'&& m<='z')||(m>='A'&&m<='Z'))
s+=1;
else if(m>='0'&&m<='9')
n+=1;
else
e+=1;
if(m=='\n')
a=0;
}
printf("%d %d %d %d",s,n,k,e-1);
/*********End**********/
return 0;
}
Sequential structure programming - Advanced
The first 1 Turn off Digital separation
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int n, a, b, c;
scanf("%d",&n);
a=n%10;// The bits of this number
n/=10;
b=n%10;// Ten digits of this number
n/=10;
c=n;// The hundredth of this number
printf("%d %d %d",c,b,a);
/*********End**********/
return 0;
}
The first 2 Turn off Find the area of the triangle
#include<stdio.h>
#include<math.h>// It's important here , Header file to add mathematical knowledge , Because the square function is called
int main(void)
{
/*********Begin*********/
double a,b,c;
scanf("%lf %lf %lf",&a,&b,&c);
double area;
double s=(a+b+c)/2;
area = s*(s-a)*(s-b)*(s-c);
area = sqrt(area);// Notice that the square function is used here sqrt
printf("%.3f",area);
/*********End**********/
return 0;
}
The first 3 Turn off Calculate the greatest common divisor of two positive integers
#include<stdio.h>
int MaxCommonFactor( int a, int b)
{
int c;
if(a<=0||b<=0)
return -1;
while(b!=0)
{
c=a%b;
a=b;
b=c;
}
return a;
}
int main(void)
{
/*********Begin*********/
int a,b;
scanf("%d,%d",&a,&b);
int c=MaxCommonFactor(a,b);
printf("%d\n",c);
/*********End**********/
return 0;
}
Sequential structure programming - Basics
The first 1 Turn off Addition operation
#include<stdio.h>
int main(void)
{
int a,b,c;
//Please input a,b:
/*********Begin*********/
scanf("%d,%d",&a,&b);
c=a+b;
printf("%d+%d=%d\n",a,b,c);
/*********End**********/
return 0;
}
The first 2 Turn off Don't use the second 3 A variable , Realize the exchange of two numbers
#include<stdio.h>
int main(void)
{
int a,b;
//Enter a and b:
scanf("%d%d",&a,&b);
printf("a=%d b=%d\n",a,b);
/*********Begin*********/
a=a^b;
b=a^b;
a=a^b;
/*********End**********/
printf("a=%d b=%d\n",a,b);
return 0;
}The first 3 Turn off Define constants with macros
#include<stdio.h>
int main(void)
{
/*********Begin*********/
const int N=30;// Define constants with const, That is, the price in the definition is 30.
int x;
scanf("%d",&x);
printf("%d",x*N);
/*********End**********/
return 0;
The first 4 Turn off Calculate the total score and average score
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int a,b,c,d,e;
scanf("%d %d %d %d %d",&a,&b,&c,&d,&e);
int s=a+b+c+d+e;//s Represents the total score
double p=s*1.0/5;//double Used to define floating point numbers （ decimal ）,p Represents the average score
printf("%d %.2f",s,p);//%.nf For output n Decimal place
/*********End**********/
return 0;
}The first 5 Turn off Solid geometry calculation problem
#include<stdio.h>
int main(void)
{
/*********Begin*********/
const double PI=3.14;// Define constants pi
double r, h, c, s, v;
scanf("%lf,%lf",&r,&h);// Note that there are commas between the inputs
c=2*PI*r;
s=4*PI*r*r;
v=PI*r*r*h;
printf("C1=%.2f\n",c);// Keep two decimal places
printf("Sb=%.2f\n",s);
printf("Vb=%.2f\n",v);
/*********End**********/
return 0;
}
Character array and its string application
1 Target deletion
#include "stdio.h"
#include "string.h"
int main()
{
char s[80];
int i,j;
scanf("%s",s);
printf("The original string: \n");
puts(s);
/***** There is an error in the following line *****/
for(i=j=0;s[i]!='\0';i++)
{
if(s[i]!= 'c')
/***** There is an error in the following line *****/
s[j++]=s[i];
}
/***** There is an error in the following line *****/
s[j]='\0';
printf("The string after deleted: \n");
puts(s);
return 0;
}
The first 2 Turn off ： Remove whitespace
#include<stdio.h>
int main(){
int i=0,j=0,k;
char str[30];
scanf("%[^\n]",str);
for(k=0;k<29;k++)// Loop maximum number of spaces
{
j=0;
for(i=0;i<30;i++)// Maximum number of words
{
if((str[i]==32&&str[i+1]!=32)||(str[i]==32&&str[i+1]==32))// Judge the space
{
j=1;
}
if(j==1)// Move the following characters forward
{
str[i] = str[i+1];
}
}
}
printf("%s \n",str);
return 0;
}
The first 3 Turn off ： String manipulation
#include <stdio.h>
int main() {
int i = 0, j = 0;
char s[20], t[20];
scanf("%s", s);
for (i = 0; i <= 20; i++) {
if (i % 2 != 0 || s[i] % 2 == 0)// Characters in odd positions or ASCII Characters with even code
t[j++] = s[i];
}
printf("%s", t);
return 0;
}The first 4 Turn off ： Find the longest string
/********** Begin **********/
#include <stdio.h>
#include <string.h>
int main()
{
int N;
char s[100][100];
int i;
int max_i, max_len = 0;
scanf("%d",&N);
for(i = 0; i < N; i ++)
{
scanf("%s",s[i]);// Input
}
for(i = 0; i < N; i ++)
{
int l = strlen(s[i]);
if(max_len <l)
{
max_len = l;
max_i = i;
}
}
printf("%s\n", s[max_i]);// Output the longest string
return 0;
}
The first 5 Turn off ： Word order
#include <stdio.h>
#include <string.h>
int main()
{
//she its can ibm1 bbc NBA nhk2 BOY jxf
//c python java c++ android caffe keras pytorch php
int N,i,k;
char j,s[100][100],a[100][100];
printf(" String before sorting ：\n");
for(i=0;i<10;i++)
{
scanf("%s",s[i]);// Input
printf("%s",s[i]);
if(i<9)
printf("\n");
fflush(stdout);
}
for(i=0;i<9;i++)
{
k=i;
for(j=i+1;j<10;j++)
{
if(strcmp(s[k],s[j])>0)
k=j;
}
if(k!=i)
{
char temp[100];
strcpy(temp, s[k]);
strcpy(s[k], s[i]);
strcpy(s[i], temp);
}
}
printf(" Sorted string ：");
for(i=0;i<10;i++)
{
printf("%s\n",s[i]);
}
return 0;
}Choose structural programming
The first 1 Turn off Sort
#include<stdio.h>
int main(void)
{
int a,b,c,temp1,temp2,temp3;
/*********Begin*********/
printf(" Please enter three integers :");
scanf("%d%d%d",&a,&b,&c);
if(a>b)
{
temp1=a;
a=b;
b=temp1;
}
if (a>c)
{
temp2=a;
a=c;
c=temp2;
}
if (b>c)
{
temp3=b;
b=c;
c=temp3;
}
printf(" From small to large, the order is :%d,%d,%d",a,b,c);
/*********End**********/
return 0;
}
The first 2 Turn off Selection structure - Leap year judgment
#include<stdio.h>
int main(void)
{
int a;
/*********Begin*********/
scanf("%d",&a);
if (a%4!=0)
printf("%d It's not a leap year ！",a);
else if (a%100==0&&a%400!=0)
printf("%d It's not a leap year ！",a);
else
printf("%d It's a leap year ！",a);
/*********End**********/
return 0;
}The first 3 Turn off Selection structure - Piecewise function problem
#include<stdio.h>
int main(void)
{
/*********Begin*********/
float x;
float a;
scanf("%f",&x);
if (x<0&&x!=-3)
{
a=x*x+x-6;
printf("%.3f",a);
}
else if (x>=0&&x<10&&x!=2&&x!=3)
{
a=x*x-5*x+6;
printf("%.3f",a);
}
else
{
a=x*x-x-1;
printf("%.3f",a);
}
/*********End**********/
return 0;
}The first 4 Turn off Student grade conversion
#include<stdio.h>
int main(void)
{
float x;
/*********Begin*********/
scanf("%f",&x);
if (x>=90&&x<=100)
{
printf("A");
}
if (x<90&&x>=80)
{
printf("B");
}
if (x>=70&&x<79)
{
printf("C");
}
if (x>=60&&x<69)
{
printf("D");
}
if (x<60&&x>=0)
{
printf("E");
}
if (x<0||x>100)
{
printf("Score is error!");
}
/*********End**********/
return 0;
}
Cyclic structure programming 2
The first 1 Turn off C loop - For the average score
#include<stdio.h>
int main()
{
int s;
float x,sum,average;
sum=0;
scanf("%d",&s);
if(s>0)
{
for(int i=0;i<s;i++)
{
scanf("%f",&x);
sum=sum+x;
}
average=sum/s;
printf("the number of students:the scores:average=%.2f",average);
}
else
printf("the number of students:the scores:average=0.00");
return 0;
}
The first 2 Turn off C loop - Find the product of your numbers
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int num=0,sum=1;
scanf("%d",&num);
while(num!=0)
{
sum*=num%10;
num/=10;
}
printf("%d",sum);
/*********End**********/
return 0;
}The first 3 Turn off C loop - Find the sum of factorials
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int n=0,sum=0;
int m=1;
scanf("%d",&n);
for(int i=1;i<=n;i++)
{
for (int j=1;j<=i;j++)
{
m=m*j;
}
sum+=m;
m=1;
}
printf("%d",sum);
/*********End**********/
return 0;
The first 4 Turn off C loop - Narcissistic number
#include<stdio.h>
#include<math.h>
int main(void)
{
/*********Begin*********/
int a=0,b=0,c=0,m=0,t=0;
scanf("%d",&t);
for(int i=100;i<=999;i++)
{
a=i/100;
b=(i-100*a)/10;
c=i-100*a-10*b;
m=pow(a,3)+pow(b,3)+pow(c,3);
if (m==i)
printf("%d ",i);
}
return 0;
}The first 5 Turn off C loop - Find the perfect number
#include<stdio.h>
int main(void)
{
/*********Begin*********/
int n=0;
scanf("%d",&n);
int i,j,sum;
for (i=1;i<=n;i++)
{
sum=0;
for(j=1;j<i;j++)
{
if(i%j==0)
sum+=j;
}
if(sum==i)
printf("%d\n",i);
}
/*********End**********/
return 0;
}
The first 6 Turn off Sum fractions
#include<stdio.h>
#include<math.h>
int main(void)
{
/*********Begin*********/
double a=1,b=-1;
double sum=0;
for(int i=1;i<=100;i++)
{
sum+=(a/i)*pow(b,i+1);
}
printf("%.3lf",sum);
/*********End**********/
return 0;
}C Introduction to basic grammar of language
The first 1 Turn off Find the absolute value
#include <stdio.h>
#include <stdlib.h>
int main()
{
int a,b;
scanf("%d",&a);
if (a<0)
b=-a;
else b=a;
printf("%d\n",b);
return 0;
}The first 2 Turn off seek m Sum of odd numbers within
#include <stdio.h>
int main()
{
int n,m, sum;
scanf("%d",&m);
n=1;
sum=0;
while(n<=m)
{
sum=sum+n;
n+=2;
}
printf("%d\n",sum);
return 0;
}
The first 3 Turn off Exclude this number or output this number
#include <stdio.h>
int main()
{
// Get parameter method scanf
//int x =0;
//int y = 0;
//scanf("%d", &x);
// The result output uses prinf
//printf("%d",x);
// Please add your code here
/********** Begin *********/
int x;
scanf("%d",&x);
if(x%3==0||x/100==3)
{
printf("%d",x);
}
else
printf(" Exclude this number ");
return 0;
/********** End **********/
}The first 4 Turn off Hospital charges .
#include <stdio.h>
int main()
{
float a,b,c,d,e,f;
scanf("%f %f %f %f",&a,&b,&c,&e);
d = a + b*c;
f = e - d;
printf(" Please enter the drug fee 、 Bed fee / God 、 Length of stay : Accounts payable :%.2f\n Actual payment : Change is required :%.2f",d,f);
return 0;
}The first 5 Turn off Recombine in reverse order
// Be careful
//1: The time of each run of the program must be less than 200 millisecond , Otherwise it will time out , Program timeouts will not test the remaining test sets
//2: The memory used for each run of this program cannot exceed 1M, Otherwise, an error will be returned
//3: The maximum output of the program per run is 1000 Characters ( Superfluous does not show ), All spaces at the end of each line are marked with □ Express
#include <stdio.h>
int main()
{
int a,b,c,d,e,f,g,h;
scanf("%4d",&a);
b = a/1%10;
c = a/10%10;
d = a/100%10;
e = a/1000%10;
f = a/10000%10;
g = a/100000%10;
h = a/1000000%10;
if(a>=1)
{
printf(" Please enter a 4 An integer : After regrouping :%d%d%d%d",b,c,d,e);
}
return 0;
}
C Language programming, editing and debugging environment
The first 1 Turn off Printout Hello World
#include<stdio.h>
int main()
{
/********* Begin *********/
printf("Hello World");
/********* End *********/
return 0;
}The first 2 Turn off Print out graphics
#include<stdio.h>
int main(void)
{
/********* Begin *********/
printf(" *\n");
printf(" ***\n");
printf(" OK\n");
printf(" Hello!\n");
printf("*********\n");
return 0;
}
The first 3 Turn off seek 3 The maximum number of
#include<stdio.h>
int main()
{
/********* Begin *********/
int max(int x,int y,int z);
int a,b,c,f;
scanf("%d,%d,%d",&a,&b,&c);
f=max(a,b,c);
printf("max=%d",f);
/********* End *********/
return 0;
}
int max(int x,int y,int z)
{
int e;
if(x>y)e=x;
else e=y;
if(e>z)e=e;
else e=z;
return e;
}
The first 4 Turn off be familiar with C Language debugging process
#include<stdio.h>
int main(void)
{int x;
int y=2,z=3;
scanf("%d",&x);
if(x==y+z)
printf("*****");
else
printf("#####" );
return 0;
} The application of function
The first 1 Turn off ： take a square root
#include <stdio.h>
#include <math.h>
/***** There is an error in the following line *****/
double fun(double a, double x0)
{
double x1, y;
x1=(x0+a/x0)/2.0;
/***** There is an error in the following line *****/
if(fabs(x1-x0)>=0.00001)
y=fun(a,x1);
else
y=x1;
return y;
}
int main()
{
double x;
scanf("%lf",&x);
printf("The square root of %lf is %lf\n",x,fun(x,1.0));
return 0;
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