实验3 循环结构程序设计

#include<stdio.h>
void main(){
	int i,sum=0;
	//方法一：
	i=1;
	while(i<=100){
		sum+=i;
		i++;
	}
	printf("sum = %d\n",sum);

	//方法二:
	i=1;
	sum = 0;
	do{
		sum+= i;
	} while (i<=100);
    printf("sum = %d\n",sum);

    //方法三：
	sum=0;
	for(i=1;i<=100;i++)
		sum+= i;
		printf("sum = %d\n",sum);
}

2.

#include<stdio.h>

int main(){

int n,i,jiec=1;

printf("请输入一个数字n: ");

scanf("%d",&n);

i=n;

while(i>=1){

jiec = jiec * i;

i--;

}

printf("%d!=%d\n",n,jiec);

return 0;

}

3.

#include<stdio.h>
int main(){
	int k,sum = 0;
	for(k=1;k<=100;k++)
		sum+=k;
	printf("sum=%d\n",sum);

	for(k=1;k<=50;k++)
		sum=sum + k * k;
	printf("sum=%d\n",sum);

	for(k=1;k<=10;k++)
		sum=sum + 1/k;
	printf("%d\n",sum);
	return 0;
}

4.

#include<stdio.h>
int main(){
	char c;
	int zm=0,sz=0,kg=0,qt=0;
	while((c=getchar())!=‘\n‘){
		if(c>=‘a‘ &&c<=‘z‘ || c>=‘A‘&&c<=‘z‘)
			zm++;
		else if(c==‘ ‘)
			kg++;
		else if(c>=‘0‘ && c<=‘9‘)
			sz++;
		else
			qt++;
	}
	printf("字母个数：%d",zm);
	printf("数字个数：%d",sz);
	printf("空格个数：%d",kg);
	printf("其他个数：%d",qt);
	return 0;
}

5.

#include<stdio.h>
int main(){
	int m,n,t,i,gys=1,gbs;
	printf("请输入两个数字：");
	scanf("%d%d",&m,&n);
	if(n>m){
		t=m;
		m=n;
		n=t;
	}
	for(i=n;i>=1;n%i==0)
		break;
		printf("m=%d,n=%d",m,n);
	if(i!=0){
		gys=i;
		printf("最大公约数为：%d\n",gys);
	}
		gbs=m*n/gys;
		printf("最大公倍数为：%d\n",gbs);
		return 0;
}

6.

#include<stdio.h>
int main(){
	int n,k1,k2,k3;
	for(n=100;n<=999;n++){
		k1 = n % 10;
		k2 = n / 10 % 10;
		k3 = n / 100;
		if(n==k1*k1*k1+k2*k2*k2+k3*k3*k3)
			printf("%d\n",n);
	}
	return 0;
}