#include<stdio.h>;
void main()
{
    int Number;

    printf("Enter a Number : n");
    scanf("%d",&Number);

    if( Number == 1 )
    printf(" The Number is %d so the weekly name is Sunday.",Number);

    else if( Number == 2 )
    printf(" The Number is %d so the weekly name is Monday.",Number);

    else if( Number == 3 )
    printf(" The Number is %d so the weekly name is Tuesday.",Number);

    else if( Number == 4 )
    printf(" The Number is %d so the weekly name is Wednesday.",Number);



    else if( Number == 5 )
    printf(" The Number is %d so the weekly name is Thursday.",Number);

    else if( Number == 6 )
    printf(" The Number is %d so the weekly name is Friday.",Number);

    else if( Number == 7 )
    printf(" The Number is %d so the weekly name is Saturday.",Number);
    else
    printf("Invalid number");

}

Output 1.

Enter a Number :
5
The Number is 5 so the weekly name is Thursday.

2.

Enter a Number :
56
Invalid number

3.

Enter a Number :
7
The Number is 7 so the weekly name is Saturday.