C program to append the contents of one file at the end of another file.

Write a ‘C’ program to append the contents of one file at the end of another file.

#include<stdio.h>
#include<conio.h>
void main()
{
FILE *fp,*fq;
char ch;
clrscr();
fp=fopen("a.txt","r");
fq=fopen("b.txt","a");
if(fp==NULL)
{
printf("file does not exist");
exit(0);
}
if(fq==NULL)
{
printf("file does not exist");
exit(0);
}
while(1)
{
ch=fgetc(fp);
if(ch==EOF)
 break;
fputc(ch,fq);
}
getch();
}

C program to copy one string into another string without using standard function.

Write a ‘C’ program to copy one string into another string without using standard function.

#include<stdio.h>
#include<conio.h>
#include<string.h>
void disp(char *,char *);
void main()
{
char t[20],s[20];
clrscr();
printf("enter the string");
gets(t);
disp(t,s);
getch();
}
void disp(char *t,char *s)
{
while(*t!='\0')
{
*s=*t;
t++;
s++;
}
printf("%s",s);
}