Why getting the error

Question

#include <stdio.h>
#include<string.h>

int main()
{
int key, i;
char data[30];

printf("ENTER THE PLAIN TEXT : ");
//scanf("%c",&data);
gets(data);
printf("ENTER THE KEY VALUE : ");
scanf ("%d",&key);

for(i=0;i<strlen(data);i++)
{
if (data[i]==' ')
{

}
else
{
if(data[i]>='x')
{
data[i]=data[i]-26;
}
data[i]=data[i]+key;
}}

printf("YOUR CEASER CIPHER TEXT IS ", data);

return 0;
}

Answer 1

All you have warnings...
Instead of gets() use fgets() function.
gets() is deprecated one..

And you are not printing result..
Use
printf("YOUR CEASER CIPHER TEXT IS %s", data);

Answer 2

Ok