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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. int main() {
  5.     char s[1000];
  6.     int i;
  7.  
  8.     printf("Enter a text: ");
  9.     fgets(s, 1000, stdin);
  10.  
  11.     for (i = 0; s[i] != '\0'; i++) {
  12.         if (i % 2 == 0) {
  13.             s[i] = toupper(s[i]);
  14.         }
  15.     }
  16.     printf("Output: %s", s);
  17.  
  18.     return 0;
  19. }
Success #stdin #stdout 0s 5280KB
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stdin
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helloworldabcd
stdout
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Enter a text: Output: HeLlOwOrLdAbCd
https://ideone.com/7H6hFs
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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