Question

while语句写1到100之和

Answer 1

方法1：笨办法
int i = 0;
int sum = 0;
while i < 100
{
i += 1;
sum = sum + i;
}

方法2：数学方法，和=（首项+末项）* 项数 /2
int sum;
sum = (1 + 100) * 100 / 2

上述两种方法计算结果都是5050

Answer 2

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

Answer 3

#include<stdio.h>
main()
{int i=0,sum=0;
while(i<=100)
{sum+=i;
i++;
}
printf("%d",sum);
}

Answer 4

int i=0;
int sum=0;
while(i<101){
sum=sum+i;
i++;
}