Question

How to append text to text file in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
  
void readFile(char file[]) {
    FILE *fp = fopen(file, "r");
       
	char ch;
    while ((ch = fgetc(fp)) != EOF)
        putchar(ch);

    fclose(fp);
}
  
int main()
{
    char file[100] = "d:\\data.txt";
  
    FILE *fp = fopen(file, "a"); // a - append 
    if (fp == NULL) {
        printf("Error open file\n");
        exit(EXIT_FAILURE);
    }
  
    fputs("\njava python", fp); // append text
  
    fclose(fp);
      
    readFile(file);
  
    return 0;
}
   
     
     
     
/*
run:
     
c c++ c#
java python 
  
*/
 

 

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