#include <stdio.h>
#include <string.h>
 
int main (void)
{
	int length;
	char pass[8];
	printf("Enter a password with 8 characters.");
	printf("It must have at least 1 digit and 1 alphabet.");
 
	fgets( pass, 8, stdin);

#include<stdio.h>
#include<string.h>
 
int main()
{
char un[7],pwd[10];
int i,f;
printf("\nEnter user name and pwd");
scanf("%s%s",un,pwd);
if(strlen(un)==7)
{
for(i=0;i<strlen(pwd);i++)
{
if(!isalnum(pwd[i]))
f=1;
}
}
if(f==1)
printf("pwd error");
else
-------proceed---------------
}