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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. // your code goes here
  5. int i,z,sum=0;
  6. scanf("%d",&i);
  7. scanf("%d",&z);
  8. for(;i<=z;i++)
  9. sum=sum+i;
  10. printf("%d",sum);
  11. return 0;
  12. }
  13.  
Success #stdin #stdout 0s 5304KB
stdin
2 4
stdout
9