Print content two files line by line - C File

C examples for File:File Read

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Description

Print content two files line by line

Demo Code

#include <stdio.h>  
#include <stdlib.h>  

int main(int argc, char *argv[])  
{  /*from   ww  w . ja  va 2 s  .c o  m*/
    int ch1, ch2;  
    FILE * f1;  
    FILE * f2;  
  
    if (argc != 3)  
    {  
        printf("Usage: %s file1 file2\n", argv[0]);  
        exit(EXIT_FAILURE);  
    }  
    if ((f1 = fopen(argv[1], "r")) == NULL)  
    {  
        printf("Could not open file %s for input\n", argv[1]);      
        exit(EXIT_FAILURE);  
    }  
    if ((f2 = fopen(argv[2], "r")) == NULL)  
    {  
        printf("Could not open file %s for input\n", argv[2]);      
        exit(EXIT_FAILURE);  
    }  
    ch1 = getc(f1);  
    ch2 = getc(f2);  
      
    while (ch1 != EOF || ch2 != EOF)  
    {  
        while (ch1 != EOF && ch1 != '\n') /* skipped after EOF reached */  
        {  
            putchar(ch1);  
            ch1 = getc(f1);  
        }  
        if (ch1 != EOF)  
        {  
            putchar('\n');  
            ch1 = getc(f1);  
        }  
        while (ch2 != EOF && ch2 != '\n') /* skipped after EOF reached */  
        {  
            putchar(ch2);  
            ch2 = getc(f2);  
        }  
  
        if (ch2 != EOF)  
        {  
            putchar('\n');  
            ch2 = getc(f2);  
        }  
    }  
          
    if (fclose(f1) != 0)  
        printf("Could not close file %s\n", argv[1]);      
    if (fclose(f2) != 0)  
        printf("Could not close file %s\n", argv[2]);      
          
    return 0;  
}

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