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  1. #include <stdio.h>
  2. #define BUFFER_SIZE 80
  3.  
  4. int readLineFromFile(FILE* file, char* buffer) {
  5.  
  6.     if(! fgets(buffer, BUFFER_SIZE, file)) {
  7.         return -1;
  8.     }
  9.     int length;
  10.     for(length=0; buffer[length] != 0; length++);
  11.     return length;
  12. }
  13.  
  14. void writeLineToFile(FILE* file, char* buffer) {
  15.     fprintf(file, "%s", buffer);
  16. }
  17.  
  18. int main(int argc, char **argv) {
  19.     if (argc != 3) {
  20.         printf("incorrect number of arguments, 2 text files expected, recieved %d\n", argc - 1);
  21.         return 0;
  22.     }
  23.     FILE* input = fopen(argv[1], "r");
  24.     FILE* output = fopen(argv[2], "w");
  25.     char buffer[BUFFER_SIZE];
  26.     int charsRead = readLineFromFile(input, buffer);
  27.     int i;
  28.     while(0 < charsRead) {
  29.         writeLineToFile(output, buffer);
  30.         charsRead = readLineFromFile(input, buffer);
  31.         printf("%d\n", i++);
  32.     }
  33.     fclose(input);
  34.     fclose(output);
  35.     return 0;
  36. }
  37.  
Success #stdin #stdout 0s 2160KB
comments (?)
stdin 
Standard input is empty
stdout 
incorrect number of arguments, 2 text files expected, recieved 0
https://ideone.com/isYhqd
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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