如何使用c语言编程输入整数n，求1+2+3+……+n和n!？

Question

如题所述

Answer 1

1. 使用c语言编程输入整数n，求1+2+3+……+n和n!

#include<stdio.h>

#include<math.h>

int main()

{

int i;

int nNumber;

int nSum = 0;

printf("Input Data:'N'");

scanf("%d", &nNumber);

for ( i = 1; i <= nNumber; i++)

{

nSum = nSum + i;

}

printf("%d\r\n", nSum);

return 0;

}

2. 使用c语言编程输入整数n，求1+2+3+……+n和n!

#include<stdio.h>

#include<math.h>

int Factorial(int n);

int Add(int n);

int main()

{    

printf("阶乘:%d\n",Factorial(10));    

printf("求和:%d\n",Add(10));

}

int Factorial(int n)

{   

if(n==1)   

{        

return 1;  

}    

else   

{        

return n*JieCheng(n-1);   

}

}
int Add(int n)

{   

int i;  

int s=0;   

for(i=1;i<=n;i++)  

{       

s+=i;  

}    

return s;

}

Answer 2

12345678910111213141516171819202122232425262728293031323334#include<stdio.h>#include<math.h> int JieCheng(int n);int QiuHe(int n); int main(){     printf("<a href="http://www.baidu.com/s?wd=%E9%98%B6%E4%B9%98&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHcvrjTdrjb0T1Yvry79nAw-n1wBP16sPHcL0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPWcLrjDsP1RLP1n3nHDzrHcY" target="_blank" class="baidu-highlight">阶乘</a>:%d\n",JieCheng(10));    printf("求和:%d\n",QiuHe(10));}//计算n!int JieCheng(int n){    if(n==1)    {        return 1;    }    else    {        return n*JieCheng(n-1);    }}//求和,1+2+3+<a href="http://www.baidu.com/s?wd=%E2%80%A6%E2%80%A6&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHcvrjTdrjb0T1Yvry79nAw-n1wBP16sPHcL0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPWcLrjDsP1RLP1n3nHDzrHcY" target="_blank" class="baidu-highlight">……</a>+nint QiuHe(int n){    int i;    int s=0;    for(i=1;i<=n;i++)    {        s+=i;    }    return s;}

这样行么。