C program to copy the contents of one file into another file.

Write a ‘C’ program to copy the contents of one file into another file.

#include<stdio.h>
#include<conio.h>
void main()
{
FILE *fp,*fq;
char ch;
clrscr();
fp=fopen("a.c","r");
fq=fopen("b.c","w");
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);
}
fclose(fp);
fclose(fq);
getch();
}

C program to accept a string from user and generate given pattern.

 Write a ‘C’ program to accept a string from user and generate following pattern.
         (e.g. input is string “abcd”)

          a
          ab
          abc
          abcd
          abc
          ab
          a        
-------------------------------------------------------------------------------------------

Solution:-

#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,k,cnt=0;
char name[10];
clrscr();
printf("enter the string");
scanf("%s",&name);
cnt= strlen(name);
        {
  cnt++;
}
printf("\n");
for(i=0;i<=cnt-1;i++)
{
for(j=0;j<=i;j++)
{
printf("%c",name[j]);
}
printf("\n");
}
for(k=i-1;k>=0;k--)
{
for(j=0;j<k;j++)
{
printf("%c",name[j]);
}
printf("\n");
}
getch();
}