#include <stdio.h>
 
int main()
{
    char myString[100]; 
    char myString2[100]="привет";
 
    FILE *f;
    f=fopen("23.txt","w");
   fprintf(f, "%s",myString2);
    fclose(f);
    f=fopen("23.txt","a");
    printf("Введите текст:  ");
    fgets( myString, 100,stdin);
    fprintf(f, "%s",myString);
 
 
 
    fclose(f);
    
   
 
 
 
    getchar();
}
}