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#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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