Question

写C程序解决问题自然数的和之和计算S=1+(1+2)+(1+2+3)+…+(1+2+…+N).已知N,要求写程序求出S.

Answer 1

void main()

{

int a,b,i,j,sum;

printf("please input the value of N:");

scanf(%d,&a);

b=a;

for(i=1;i