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a guest Dec 8th, 2019 63 Never
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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <ctype.h>
  4.  
  5.  
  6. int main(int argc, char *argv[]) {
  7.  
  8.     if(argc != 2){
  9.         printf("Wrong number of arguments!\n");
  10.         exit(EXIT_FAILURE);
  11.     }
  12.  
  13.     char ch;
  14.     FILE * fp = fopen(argv[1], "r");
  15.  
  16.     if(fp == NULL) {
  17.         printf("Error opening file!\n");
  18.         exit(EXIT_FAILURE);
  19.     }
  20.  
  21.      while((ch = fgetc( fp )) != EOF) {
  22.  
  23.          if(isupper(ch)) {
  24.              ch = ch + 32;
  25.          }
  26.          printf("%c", ch);
  27.  
  28.      }
  29.      
  30.      fclose(fp);
  31.  
  32.     return EXIT_SUCCESS;
  33. }
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