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  1. # include <stdio.h>
  2.  
  3. void myToUpper(char s[]){
  4. for(int i=0; s[i]!='\0'; i++){
  5. if('a'<=s[i]&&s[i]<='z'){
  6. s[i]=s[i]-32;
  7. }
  8. }
  9. }
  10.  
  11. int main(){
  12. char s[100];
  13. scanf("%s",s);
  14. printf("%s -> ",s);
  15. myToUpper(s);
  16. printf("%s\n",s);
  17. return 0;
  18. }
  19.  
Success #stdin #stdout 0s 5288KB
stdin
aBcDe
stdout
aBcDe -> ABCDE