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uppercase input to lowercase output

/ Published in: C
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  1. /* output in lowercase */
  2.  
  3. #include <stdio.h>
  4.  
  5. int lower(int upper);
  6.  
  7. int main(int argc, const char *argv[]){
  8.     int c;
  9.     c=getchar();
  10.     while(c != EOF){
  11.         if(c<65 || c>90){
  12.             putchar(c);
  13.             c=getchar();
  14.         }
  15.         else{
  16.             putchar(lower(c));
  17.             c=getchar();
  18.         }
  19.     }
  20. }
  21.  
  22. int lower(int upper){
  23.           upper=upper+32;
  24.           return(upper);
  25. }

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