C语言编程问题！！急用。。。 用递归算法编写，求1到n的累加和，在主函数中调用

Answer 1

#include <stdio.h>

unsigned int func(unsigned int n)
{
return (n == 1)? 1 ： n * func(n-1);
}

int main(void)
{
unsigned int n = 0, rval = 0;

printf("Input data:");
scanf("%u", &n);

if (n == 0)
{
printf("Input error.\n");
return -1;
}

rval = func(n);
printf("%u!=%u\n", n, rval);

return 0;

}

Answer 2

int fun(int n)
{
if (n < 1)
{
return 0;
}
if (n == 1)
{
return 1;
}
return n + fun(n-1);
}
mian()
{
scanf("%d",&n);
printf("%d", fun(100));
}

Answer 3

int fun(int n) {
if (n < 1) {
return 0;
}
if (n == 1) {
return 1;
}
return n + fun(n-1);
}

mian() {
printf("%d", fun(100));
}

Answer 4

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Answer 5

#include <stdio.h>
int fun(int n)
{
int sum = 0;
if (n == 1)
sum = n;
else
sum = n + fun (n-1);
return sum;
}

void main()
{
int n;
scanf("%d",&n);
printf("%d",fun(n));
}