1)
#include <stdio.h>
int main()
{
   int n;
   scanf("%d", &n);
   if(n % 2 == 0)
    printf("The Number is even\n");
   else
    printf("The number is odd\n");

}
2)
#include <stdio.h>
int main()
{
   int a , b, c;
   scanf("%d %d %d", &a , &b, &c);
   if(a > b && a > c)
    printf("A is max\n");
   else if(b > c && b > a)
    printf("B is max\n");
   else
    printf("C is max\n");

}
3)
#include <stdio.h>

int main()
{
    int year;

    scanf("%d", &year);

    if ( year%400 == 0)
        printf("%d is a leap year.\n", year);
    else if ( year%100 == 0)
        printf("%d is not a leap year.\n", year);
    else if ( year%4 == 0 )
        printf("%d is a leap year.\n", year);
    else
        printf("%d is not a leap year.\n", year);

    return 0;
}
5)
#include <stdio.h>

int main()
{
    int marks;

    scanf("%d", &year);
    if(marks >= 80 && marks <= 80)
        printf("A+\n");
    else if(marks >= 70 && marks < 80)
    printf("A\n");
    else if(marks >= 60 && marks < 70)
    printf("A-\n");
    else if(marks >= 50 && marks < 60)
        printf("B\n");
    else if(marks >= 40 && marks < 50)
        printf("C\n");
    else
        printf("Fail\n");

    return 0;
}
7)
#include <stdio.h>

int main()
{
   char ch;
   scanf(" %c", &ch);
   switch(ch)
   {
   case 'a':
    printf("Vowel\n");
    break;
    case 'e':
    printf("Vowel\n");
    break;
    case 'i':
    printf("Vowel\n");
    break;
    case 'o':
    printf("Vowel\n");
    break;
    case 'u':
    printf("Vowel\n");
    break;
    default:
        printf("Consonant\n");
        break;
   }
}