Question

C语言编写程序，求1+2+3+4+……..+100的和

C语言
编程题，
编一程序: 求1+2+3+4+……..+100的和

Answer 1

#include "stdio.h"

int sum(int n)
{
int sum =0 ;
for (int i =0;i<=n;i++)
{
sum +=n;
}
return sum;
}
void main(void)
{
int sum =0;

sum =sum (100);
printf("sum is %d",sum);
}

Answer 2

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

Answer 3

int func()
{
int i, k;
for(k = 0, i = 1; i <= 100; i++)
{
k += i;
}
return k;
}