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C language programming (Third Edition)
2022-07-27 16:09:00 【std i hurt o love】
Catalog
11 page
Third question
（1）
#include<stdio.h>
int main()
{
int a_mxy,b,c;
printf(" Please enter the value of the two numbers to be exchanged :\n");
scanf("%d %d",&a_mxy,&b);
c=a_mxy;
a_mxy=b;
b=c;
printf(" The value after exchange is %d %d\n",a_mxy,b);
return 0;
}（2）
#include<stdio.h>
int main()
{
double s_mxy=0;
int i=0;
while(++i<=100)
{
s_mxy+=1.0/i;
}
printf(" Calculation results ：%lf\n",s_mxy);
return 0;
}57 page
The first question is
#include<stdio.h>
int main()
{
double l1_mxy,l2,h;
printf(" Please enter trapezoidal upper bottom , Bottom , high ：\n");
scanf("%lf %lf %lf",&l1_mxy,&l2,&h);
printf(" The area of the trapezoid is :%lf\n",(l1_mxy+l2)*h/2);
return 0;
}The second question is
#include<stdio.h>
int main()
{
double lenth_mxy,width,x;
printf(" Please enter the length and width of the rectangular lawn , And the speed of mowing the lawn x:\n");
scanf("%lf %lf %lf",&lenth_mxy,&width,&x);
printf(" The time required for mowing the lawn is ：%lf\n",lenth_mxy*width/x);
return 0;
}Third question
#define PI 3.14
#include<stdio.h>
int main()
{
double r_mxy,h;
printf(" Please enter the radius and height of the cylinder :\n",&r_mxy,&h);
scanf("%lf %lf",&r_mxy,&h);
printf(" The volume of the cylinder is :%lf, The surface area of the cylinder is :%lf\n",PI*r_mxy*r_mxy*h,2*PI*r_mxy*(h+r_mxy));
return 0;
}Fourth question
#include<stdio.h>
#include<math.h>
int main()
{
double x1_mxy,y1,x2,y2;
printf(" Please enter the coordinates of two points ：\n");
scanf("%lf %lf %lf %lf",&x1_mxy,&y1,&x2,&y2);
printf(" The distance between two points is :%lf\n",sqrt((x1_mxy-x2)*(x1_mxy-x2)+(y1-y2)*(y1-y2)));
return 0;
}Fifth question
#include<stdio.h>
int main()
{
float B_mxy,S,P,T;
printf(" Please enter the basic salary , Basic turnover of this month , Percentage of turnover Commission ：\n");
scanf("%f %f %f",&B_mxy,&S,&P);
T=B_mxy+S*P;
printf(" The actual salary is ：%f\n",T);
return 0;
}Sixth question
#include<stdio.h>
int main()
{
int n_mxy,sum=0;
printf(" Please enter a number :\n");
scanf("%d",&n_mxy);
while(n_mxy)
{
sum+=n_mxy%10;
n_mxy/=10;
}
printf(" The sum of digits is :%d\n",sum);
return 0;
}Question seven
#include<stdio.h>
int main()
{
double A1_mxy,B1,C1,A2,B2,C2,x,y;
printf(" Please enter the coefficient constant ：\n");
scanf("%lf %lf %lf %lf %lf %lf",&A1_mxy,&B1,&C1,&A2,&B2,&C2);
x=(C1*B2-C2*B1)/(A1_mxy*B2-A2*B1);
y=(C1*A2-C2*A1_mxy)/(B1*A2-B2*A1_mxy);
printf(" Explain x=%lf,y=%lf\n",x,y);
return 0;
}95 page
The first question is
#include<stdio.h>
int main()
{
double x_mxy,y;
printf(" Please enter x Value \n");
scanf("%lf",&x_mxy);
if(x_mxy<0)
y=2*x_mxy-1;
else if(x_mxy<10)
y=2*x_mxy+10;
else if(x_mxy<100)
y=2*x_mxy+100;
else
y=x_mxy*x_mxy;
printf("y=%lf\n",y);
return 0;
}The second question is
#include<stdio.h>
int Judge(int n)
{
if(n%6&&n%9&&n%14)
return 0;
else
return 1;
}
int main()
{
int n_mxy;
printf(" Please enter a number :\n");
scanf("%d",&n_mxy);
if(Judge(n_mxy))
printf("%d Can be 6、9、14 to be divisible by \n",n_mxy);
else
printf("%d Can not be 6、9、14 to be divisible by \n",n_mxy);
return 0;
}Third question
#include<stdio.h>
int Judge(int n)
{
if(n==n%100)
return 1;
else
return 0;
}
int main()
{
int m_mxy;
printf(" Please enter a number :\n");
scanf("%d",&m_mxy);
if(Judge(m_mxy))
printf("%d Shou form number \n",m_mxy);
else
printf("%d Not conformal number \n",m_mxy);
return 0;
}Fourth question
#inclue<stdio.h>
int main()
{
int dB_mxy;
printf(" Please enter a value in decibels :\n");
scanf("%d",&dB_mxy);
if(dB_mxy<=50)
printf(" quiet \n");
else if(dB_mxy<=70)
printf(" Make a noise , Harmful to nerves \n");
else if(dB_mxy<=90)
printf(" Very noisy. , Nerve cells are destroyed \n");
else if(dB_mxy<=100)
printf(" The noise intensified , Hearing loss \n");
else if(dB_mxy<=120)
printf(" Unbearable , Take one minute to temporarily deafen \n");
else
printf(" Extremely deaf or totally deaf \n");
return 0;
}Fifth question
#include<stdio.h>
int getprice(int a,int b)
{
int tnum,sump=0;
if(a&&b)
{
if(a>b)
{
tnum=b;
if(tnum<50)
sump+=tnum*90+(a-tnum)*60;
else
sump+=tnum*80+(a-tnum)*60;
}
else
{
tnum=a;
if(tnum<50)
sump+=tnum*90+(b-tnum)*45;
else
sump+=tnum*80+(b-tnum)*45;
}
}
else
{
if(a)
sump=a*60;
else
sump=b*60;
}
return sump;
}
int main()
{
int a_mxy,b;
printf(" Please enter the number of tops and bottoms purchased ：\n");
scanf("%d %d",&a_mxy,&b);
printf(" The total amount of collection is %d\n",getprice(a_mxy,b));
return 0;
}Sixth question
#include<stdio.h>
#include<math.h>
double getY(double a,double b)
{
double Y;
if(a>0)
{
if(b>0)
Y=cos(a)+cos(b);
else
Y=sin(a)+sin(b);
}
else
{
if(b>0)
Y=cos(a)+sin(b);
else
Y=sin(a)+cos(b);
}
return Y;
}
int main()
{
double a_mxy,b,Y;
printf(" Please enter a,b Value \n");
scanf("%lf %lf",&a_mxy,&b);
Y=getY(a_mxy,b);
printf("Y The value of is %lf\n",Y);
return 0;
}Question seven
#include<stdio.h>
int main()
{
double p_mxy,w,s,d,f;
printf(" Please enter the basic freight , The weight of the goods , distance :\n");
scanf("%lf %lf %lf",&p_mxy,&w,&s);
if(s<250)
d=0;
else if(s<500)
d=0.02;
else if(s<1000)
d=0.05;
else if(s<2000)
d=0.08;
else if(s<3000)
d=0.1;
else
d=0.15;
f=p_mxy*w*s*(1-d);
printf(" The total freight is %lf\n",f);
return 0;
}122 page
The first question is
#include<stdio.h>
int main()
{
int x=1,sum=0;
for(x=1;x<=20;x++)
sum+=2*x*x+3*x+1;
printf(" The result is %d\n",sum);
return 0;
}The second question is
#include<stdio.h>
int main()
{
int n,i=1;
double sum=0;
printf(" Please enter n Value （n<=1600）：\n");
scanf("%d",&n);
for(i=1;i<=n;i++)
sum+=(double)(4*i*i)/(2*i-1)*(2*i+1);
printf(" The result is :%lf\n",sum);
return 0;
}Third question
#include<stdio.h>
double getmoney(double t,double r,int n)
{
while(n--)
{
t=t*(1+r);
}
return t;
}
int main()
{
double t,r;
int n;
printf(" Please enter the principal , The interest rate , Deposit years :\n");
scanf("%lf %lf %d",&t,&r,&n);
printf(" The principal and interest are ：%lf\n",getmoney(t,r,n));
return 0;
}Fourth question
#include<stdio.h>
int Isyear(int n)
{
if(n%4==0&&n%100||n%400==0)
return 1;
else
return 0;
}
int main()
{
int i=1;
for(i=1;i<=10000;i++)
{
if(Isyear(i))
printf("%-5d",i);
}
return 0;
}Fifth question
#include<stdio.h>
int main()
{
int i=1,n=20,s=2;
double sum=0;
while(n--)
{
sum+=(double)s/i;
s+=i;
i=s-i;
}
printf(" The result is :%lf\n",sum);
return 0;
}Sixth question
#include<stdio.h>
int main()
{
int i=1;
double sum=0,ret=1;
while(ret>1.0E-6)
{
ret=1.0/(i*i+1);
sum+=ret;
i++;
}
printf(" The result is :%lf\n",sum);
return 0;
}Question seven
#include<stdio.h>
int main()
{
int i=1;
double sum=0,ret=1;
while(ret>1.0E-6)
{
ret=1.0/i;
sum+=ret;
i+=i+1;
}
printf(" The result is :%lf\n",sum);
return 0;
}The eighth question
#include<stdio.h>
int main()
{
int count=0;
double n=14,r=0.008;
while(n<26)
{
n=n*(1+r);
count++;
}
printf(" need %d reach 26 Billion \n",count);
return 0;
}Question 9
#include<stdio.h>
int main()
{
double temp=1,ret=1,sum=1,i=1;
while(temp>1.0E-5)
{
temp=1.0/ret;
sum+=temp;
i++;
ret*=i;
}
printf(" The result is :%lf\n",sum);
return 0;
}Question 10
#include<stdio.h>
int main()
{
int n=1,sum=0,ret=1;
while(n++<=20)
{
sum+=ret;
ret*=n;
}
printf(" The result is :%d\n",sum);
return 0;
}Eleventh questions
#include<stdio.h>
#include<math.h>
int wfnum(int n)
{
int sum=0,ret=n;
while(ret)
{
sum+=(int)pow(ret%10,3.0);
ret/=10;
}
if(sum==n)
return 1;
else
return 0;
}
int main()
{
int i=100;
for(i=100;i<1000;i++)
{
if(wfnum(i))
printf("%d ",i);
}
return 0;
}Twelfth questions
#include<stdio.h>
int Istnum(long long n)// Here, you can use string to find the number of hands of any bit
{
int i = 0;
while (n / pow(10, i) >= 10)
{
i++;
}
if (n == pow(n%pow(10, i)), 2)
return 1;
else
return 0;
}
int main()
{
long long n;
printf(" Please enter a number :\n");
scanf("%lld", &n);
if (Istnum(n))
printf("%lld Shou form number \n",n);
else
printf("%lld Not conformal number \n");
return 0;
}Thirteenth questions
#include<stdio.h>
long long Snum(long long a, int n)
{
long long sum = 0,ret = a;
while (n--)
{
sum += a;
a = a * 10 + ret;
}
return sum;
}
int main()
{
long long a;
int n;
printf(" Please enter a and n\n");
scanf("%lld %d", &a, &n);
printf(" The result is %lld\n", Snum(a, n));
return 0;
}Fourteenth questions
#include<stdio.h>
int Comnum(int n)
{
int sum = 0, i = 0;
while (sum != n)
{
sum += ++i;
if (sum > n)
return 0;
}
return 1;
}
int main()
{
int i = 1;
for (i = 1; i <= 1000; i++)
{
if (Comnum(i))
printf("%d ", i);
}
return 0;
}Question 15
#include<stdio.h>
int main()
{
int grade = 0, c_1 = 0, c_2 = 0, c_3 = 0, c_4 = 0, c_5=0, n = 20;
printf(" Please enter 20 Achievements \n");
while (scanf("%d", &grade) && n--)
{
if (grade >= 90)
c_1++;
else if (grade >= 80)
c_2++;
else if (grade >= 70)
c_3++;
else if (grade >= 60)
c_4++;
else
c_5++;
}
printf("90 The number of people with more than points is :%d,80~89 For the :%d,70~79 For the :%d,60~69 For the :%d, Less than 60 Divided into :%d\n", c_1, c_2, c_3, c_4, c_5);
return 0;
}Sixteen
#include<stdio.h>
int main()
{
int count = 0, grade;
double sum = 0;
printf(" Please enter the grade \n");
while (scanf("%d", &grade) && grade != -99)
{
count++;
sum += grade;
}
printf(" The average student grade is ：%lf\n",sum/count);
return 0;
}Seventeen
#include<stdio.h>
int Dtnum(int m, int n)
{
int i = 1, sum = 0;
for (i = 1; i <= n; i++)
{
if (m%i == 0 && n%i == 0)
sum += i;
}
return sum;
}
int main()
{
int m, n;
printf(" Please enter two numbers :\n");
scanf("%d %d", &m, &n);
printf(" The sum of the common divisors is :%d\n", Dtnum(m, n));
return 0;
}Question 18
#include<stdio.h>
int main()
{
int boy, girl, child;
for (boy = 0; boy < 10; boy++)
{
for (girl = 0; girl < 13; girl++)
{
for (child = 0; child < 37; child++)
{
if (4 * boy + 3 * girl+child ==36&& boy + girl + child == 36)
printf(" Need a man %d people , Woman %d people , pediatric %d people .\n", boy, girl, child);
}
}
}
}Question 19
#include<stdio.h>
int main()
{
int x, y, z;
for (x = 1; x <= 600; x++)
{
for (y = x + 1; y <= 800; y++)
{
for (z = y + 1; z <= 1000; z++)
{
if (x*x + y * y == z * z)
printf(" A set of Pythagorean numbers :%d %d %d\n", x, y, z);
}
}
}
}Twenty questions
#include<stdio.h>
#include<math.h>
double calu(double n)
{
double sum=1;
while(n)
{
sum*=n;
n--;
}
return sum;
}
double f(double n,double x)
{
return pow(-1.0,n-1)*pow(x,2*n-1)/calu(2*n-1);
}
double Mysin(double x)
{
double sum=0,ret=x;
double i=1;
while(fabs(ret)>1.0E-5)
{
ret=f(i,x);
sum+=ret;
i++;
}
return sum;
}
int main()
{
double x;
printf(" Please enter x Value :\n");
scanf("%lf",&x);
printf("Mysin(%lf)=%lf\n",x,Mysin(x));
return 0;
}Twenty one questions
#include<stdio.h>
int Fibonacci(int n)
{
if(n==1||n==2)
return 1;
else
return Fibonacci(n-1)+Fibonacci(n-2);
}
int main()
{
int n;
printf(" Please enter n Value :\n");
scanf("%d",&n);
printf(" Fibonacci number one %d Item is :%d\n",n,Fibonacci(n));
return 0;
}Question 22
#include<stdio.h>
double p(int n,int x)
{
if(n==0)
return 1;
else if(n==1)
return x;
else
return (2*n-1)*x-p(n-1,x)-(n-1)*p(n-2,x)/n;
}
int main()
{
int n,x;
printf(" Please enter n,x Value \n");
scanf("%d %d",&n,&x);
printf(" The result is :%lf\n",p(n,x));
return 0;
}166 page
The first question is
#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
char a[100];
printf(" Please enter the string \n");
gets(a);
int bc = 0, sc = 0, digit = 0, len = strlen(a), i;
for (i = 0; i < len; i++)
{
if (isupper(a[i]))
bc++;
if (islower(a[i]))
sc++;
if (isdigit(a[i]))
digit++;
}
printf(" Capital %d individual , Lowercase letters %d individual , Numbers %d individual \n", bc, sc, digit);
return 0;
}The second question is
#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
char str1[100], str2[100];
printf(" Please enter the string \n");
gets(str2);
int i, j = 0;
for (i = 0; i < strlen(str2); i++)
{
if (islower(str2[i]))
str1[j++] = str2[i];
}
str1[j] = '\0';
printf("%s\n", str1);
}Third question
#include<stdio.h>
#include<string.h>
int _upr_len(char str[])
{
int count = 0, i;
for (i = 0; i < strlen(str); i++)
{
if (str[i] >= 'A'&&str[i] <= 'Z')
count++;
}
}
int main()
{
char a[100];
printf(" Please enter the string \n");
gets(s);
printf(" The number of capital letters is ：%d\n", _upr_len(a));
return 0;
}Fourth question
#include<stdio.h>
#include<string.h>
#include<ctype.h>
void fun(char*s)
{
int i;
for (i = 0; i < strlen(s); i++)
{
if(isupper(s[i]))
s[i]=tolower(s[i]);
else if (islower(s[i]))
s[i]=toupper(s[i]);
}
}
int main()
{
char a[100];
printf(" Please enter the string \n");
gets(a);
fun(a);
printf(" Converted String \n");
printf("%s",a);
return 0;
}Fifth question
#include<stdio.h>
#include<string.h>
void str_inv(char*s)
{
int i = 0, len = strlen(s);
while (i < len/2)
{
char ret = s[i];
s[i] = s[len - i-1];
s[len - i-1] = ret;
i++;
}
}
int main()
{
char a[100];
printf(" Please enter the string \n");
gets(a);
str_inv(a);
printf(" The string in reverse order \n");
printf("%s", a);
return 0;
}Sixth question
#include<stdio.h>
#include<string.h>
int str_cmp(char s1[], char s2[])
{
while (*s1++==*s2++&&*s1!='\0'&&*s2!='\0')
{
;
}
return *s1 - *s2;
}
int main()
{
int s1[100], s2[100];
printf(" Please enter the string s1\n");
gets(s1);
printf(" Please enter the string s2\n");
gets(s2);
if (!str_cmp(s1, s2))
printf(" Two strings are equal \n");
else
printf(" Two strings are not equal \n");
return 0;
}Question seven
#include<stdio.h>
#include<string.h>
void replace(char s[], char c1, char c2)
{
int i;
for (i = 0; i < strlen(s); i++)
{
if (s[i] == c1)
s[i] = c2;
}
}
int main()
{
char s[100], c1, c2;
printf(" Please enter the string \n");
gets(s);
printf(" Please enter the replaced character \n");
scanf("%c", &c1);
printf(" Please enter replacement characters \n");
getchar();
scanf("%c", &c2);
replace(s, c1, c2);
printf(" Replaced string \n");
printf("%s", s);
return 0;
}
The eighth question
#include<stdio.h>
#include<string.h>
#include<ctype.h>
void str_encrypt(char str[])
{
int i;
for (i =0; i < strlen(str); i++)
{
if (isupper(str[i]))
{
if (isalpha(str[i] + 4))
str[i] += 4;
else
str[i] = 'D' - 'Z' + str[i];
}
else if (islower(str[i]))
{
if(isalpha(str[i] + 4))
str[i] += 4;
else
str[i] = 'd' - 'z' + str[i];
}
}
}
int main()
{
char s[100];
printf(" Please enter the string \n");
gets(s);
str_encrypt(s);
printf(" The encrypted string \n");
printf("%s", s);
return 0;
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