Question

c语言用while循环求等差数列1 4 7 10……100之和

Answer 1

#include <stdio.h>
#include<stdlib.h>
int main()
{ 
	int i=1,sum=0;
	while(i<=100){
		sum+=i;
		i+=3; 
	}
	printf("%d",sum);		
	return 0; 
}
/*
运行结果：
1717
*/

Answer 2

#include <stdio.h>
int main(void)
{
int i = 1;
int sum = 0;
while(i <= 100)
{
sum = sum + i;
i=i+3;
}
printf("1+4+7+......+100 = %d\n",sum);

}