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  1. # include <stdio.h>
  2.  
  3. void myToUpper(char s[]){
  4. int i;
  5. for(i=0;s[i]!='\0';i++){
  6. if('a'<=s[i] && s[i]<='z'){
  7. s[i]=s[i]-32;
  8. }
  9. }
  10. }
  11.  
  12. int main(){
  13. char s[100];
  14. scanf("%s",s);
  15. printf("%s -> ",s);
  16. myToUpper(s);
  17. printf("%s\n",s);
  18. return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5292KB
stdin
aBcDe
stdout
aBcDe -> ABCDE