<stdio.h>
int
main
(void)
{
int
a,i
int
n,sum
printf("1+2+3+…+n=???,请输入n,程序将给出计算.\n")
scanf("%d",&n)
printf("这个N取值过小,请重新输入.\n")
getch()
while(i
<=
n)
{
sum
=
0
sum
+=
i++
}
printf("1+2+3+…+n=%d\n",sum)
if
(n<3)
return
0
}
#include <stdio.h>int main()
{
int n, nn
printf("input a number: ")
scanf("%d", &n)
for (int i = 1i <= n++i)
{
nn = 1
for (int j = 1j <= i++j)
{
nn = nn * j
}
printf("%d! = %d\n", --j, nn)
}
return 0
}
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