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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int sum = 0, k,n,istrue=1 ; 
  5.     while(istrue){
  6.       printf("input and integer : ");
  7.        scanf("%d",&n);
  8.        if(n==0) break;
  9.         for(k=0; k<=n ; k++){
  10.           sum +=k ;
  11.         }
  12.       printf("the sum from 1 to %d is %d \n",n,sum);
  13. istrue=0;
  14.  
  15. }
  16.  
  17.  
  18.  
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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10
stdout
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input and integer : the sum from 1 to 10 is 55
https://ideone.com/xBTQaq
language:
C (gcc 8.3)
created:
10 hours ago
visibility:
public

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