If the id is not correct then display "INVALID USER ID".
#include<stdio.h>
void main()
{
char id;
int pass;
printf("Enter user id and password");
scanf("%c %d", &id, &pass);
if(id=='A')
{
if(pass==101)
printf("\nLOGIN SUCCESSFUL");
else
printf("\nINVALID PASSWORD");
}
else
{
printf("\nINVALID USER ID");
}
}
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