Question

c语言中1-2+3-4+5…………+100的值

Answer 1

楼上的其实都是一个错误，将int sum;改为int sum=0;就可以运行了

追问

你写一个完整的嘛

追答

#include
int main()
{
int n = 1,i, sum=0;
for(i =1; i <= 100; i++)
{
sum =sum+ n* i;
n *= (-1);
}
printf("%d\n", sum);
return 0;
}

Answer 2

#include "stdio.h"
void main()
{
int i,tag,sum;
sum=0;
tag=1;
for(i=1;i<=100;i++)
{
sum+=i*tag;
tag=-tag;
}
printf("%d\n",sum);
}

Answer 3

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

Answer 4

int sign = 1, sum;
for(int i =1; i <= 100; i++)
{
sum += sign * i;
sign *= (-1);
}
printf("%d", sum);

Answer 5

main()
{
int n = 1,i, sum;
for(int i =1; i <= 100; i++)
{
sum += n* i;
n *= (-1);
}
printf("%d\n", sum);
}