求sum=1+1/(1+2)+1/(1+2+3)+++1/(1+2+3+++n),用C语言怎么写

求sum=1+1/(1+2)+1/(1+2+3)+++1/(1+2+3+++n),用C语言怎么写
求sum=1+1/(1+2)+1/(1+2+3)+++1/(1+2+3+++n),用C语言怎么写

求sum=1+1/(1+2)+1/(1+2+3)+++1/(1+2+3+++n),用C语言怎么写
1 #include
2 main(){
3 int sum=0;
4 int n;
5 int a=0;
6 int b=0;
7 printf("input n:");
8 scanf("%d",&n);
9 printf("sum=");
10 for(a=1;a