Encryption by using C asked in AMCAT

#include<conio.h>
#include<stdio.h>
void main()
{
clrscr();
char ch[6] = {'s','a','m','p','l','e'};
int a[6];
int c=5;
printf("Entered String Is ::");
for(int i=0;i<=6;i++)
printf("%c",ch[i]);

for(i=0;i<6;i++)
{
a[i] = ((int)ch[i])+c;
c--;
}

printf("\nEncrypted String is::");
for(int j=0;j<6;j++)
{
printf("%c",a[j]);
}

getch();
}