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  1. //Q84. Convert a lowercase string to uppercase without using built-in functions.
  2. #include <stdio.h>
  3. int main() {
  4.     char str[100];
  5.     int i;
  6.     gets(str);
  7.     for(i=0; str[i]!='\0'; i++)
  8.         if(str[i]>='a' && str[i]<='z')
  9.             str[i] = str[i] - 32;  
  10.     printf("%s", str);
  11. }
  12.  
  13.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin 
hello
stdout 
HELLO
https://ideone.com/o8yt6I
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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