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  1. #include <stdio.h>
  2.  
  3. int calculate(int n1,int n2);
  4. int read_num();
  5.  
  6. int main(){
  7.     int num1,num2,sum;
  8.  
  9.     test(calculate(1, 10) == 30, "test1");
  10.     test(calculate(2, 4) == 6, "test2");
  11.  
  12.     num1 = read_num();
  13.     num2 = read_num();
  14.     sum  = calculate(num1,num2);
  15.     printf("Answer: %d",sum);
  16.  
  17.     return 0;
  18. }
  19.  
  20. int read_num() {
  21.     int i;
  22.  
  23.     printf("Please enter any number: ");
  24.     scanf("%d",&i);
  25.     return(i);
  26. }
  27.  
  28. void test(int v, char* msg) {
  29.     if (!v) {
  30.         printf("error: ");
  31.         puts(msg);
  32.     }
  33. }
  34.  
  35. int calculate(int n1,int n2){
  36.     int summ=0;
  37.     while(n1 <= n2){
  38.         if(n1 % 2 == 0) {
  39.             summ += n1;
  40.         }
  41.         n1++;
  42.     }
  43.     return summ;
  44. }
  45.  
Success #stdin #stdout 0s 1836KB
comments (?)
stdin 
4 6
stdout 
Please enter any number: Please enter any number: Answer: 10
https://ideone.com/PxYH9A
10
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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