#include <stdio.h>
int main() { char input[100],output[100]; int i,j=0,n,enckey=0,deckey; printf("enter intput data size to encrypt"); scanf("%d",&n); for(i=0;i<=n;i++) { scanf("%c",&input[i]); } for(i=0;i<=n;i++) { output[i]=input[i]+j; j++; } for(i=0;i<=n;i++) { printf("%c",output[i]); enckey=output[i]+enckey; } //printf("\n%d",enckey); printf("if u want to decrypt enter key"); scanf("%d",&deckey); if(deckey==enckey) { for(i=0;i<=n;i++) { printf("%c",input[i]); } } else { printf("wrong key"); }
return 0;
}