What function should i use for comparing the last 3 characters of strings?

Question

Hi all
I am writing code for printing the all students' names whose average mark is prime number and whose last name (l_name) ends with "yan"
what should I do? strstr() function does not help as it works from the first character and it's not excluded that "yan" can appear not at the end of string? I should check the ending

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct student
{
char f_name[50];
char l_name[70];
int avg_mark;

}
void main()
{
int i,j;
int n;
scanf("%d", &n);
student *x=(student*)malloc(n*sizeof(student))
for (i=0; i<n; i++)
scanf ("%s%s%d",
x[i].f_name,
x[i].l_name,
&x[i].avg_mark
);
for (i=0;i<n;i++)
for(j=2;j<=x[i].avg_mark/2;j++)
if (x[i].avg_mark/j!=0)

printf("%f", x[i].avg_mark);

}

thanks in advance

Answer 1

Use strcmp like this:
if (strcmp(&x[i].l_name[strlen(n)-3], "yan") == 0)

you must make sure strlen is 3 or more to prevent index error. strcmp returns negative for less than, zero for equal, and positive for greater.

Answer 2

That test will only check the last three characters of the name.

Answer 3

The problem is if someone's last name is agyanban, the program should not print it
But if it's agbanyan the program should print the frist name and last name on the desktop. It ends with yan