reason for runtime error in my c program &? - runtime-error

Question

#include<stdio.h>
main()
{char *names[4];
int i,a;
printf("ënter the guests names\n");
for(i=0;i<=3;i++)
{
scanf("%s",names[i]);
}
char *yourname;
printf("\nenter your name ");
scanf("%c",yourname);
for(i=0;i<=3;i++)
{a=strcmp(names[i],yourname);
if(a==0)
printf("\nwelcome");
break;
}
if(a!=0)
printf("\naccess denied");
return 0;
}
this is a program to check your entry in a show. first we give permitted names & then it asks your name ,it compares your name with the names in the guest list.
i m getting runtime error, plz tell me the correction.i want to use pointers to string so plz suggest correction in the existing program
when i run this program in devc++ after entering first name it gives program.exe stopped working.

Answer 1

The code will be like this:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{
char *names[4];
int i,a;
printf("ënter the guests names\n");
for(i=0;i<=3;i++) {
names[i] = (char*) malloc(100 * sizeof(char));
scanf("%s", names[i]);
}
char yourname[100];
printf("\nenter your name ");
scanf("%s",yourname);
for(i=0;i<=3;i++) {
a = strcmp(names[i], yourname);
if (a == 0) break;
}
if (a==0)
printf("\nwelcome");
else printf("\naccess denied");
for(i=0;i<=3;i++)
free(names[i]);
return 0;
}

Answer 2

Your code have to be formated so we can give you a better answer.
Now, use gets to take your input, verify the guest match with your name inside the for loop, stop the loop when a match is found.
#include<stdio.h>
#include<string.h>
int main()
{
char names[4][20];
int i = 0;
int a = 0;
printf("Enter guests names: \n");
for(i=0; i<3; i++)
{
gets(names[i]);
}
char yourname[20];
printf("\n Enter your name ");
gets(yourname);
printf("\n Verify access right:");
for(i=0; i<3; i++)
{
a=strcmp(names[i], yourname);
if(a==0)
{
printf("\n welcome");
break;
}
else
{
printf("\n access denied");
}
}
return 0;
}
Although this looks like a homework assignment.