Nwabueze Precious Akunna 
18/sci01/055
Csc 206



1)#include <stdio.h>
int main() {
    int year;
    printf("Enter a year: ");
    scanf("%d", &year);
    if (year % 4 == 0) {
        if (year % 100 == 0) {
            // the year is a leap year if it is divisible by 400.
            if (year % 400 == 0)
                printf("%d is a leap year.", year);
            else
                printf("%d is not a leap year.", year);
        } else
            printf("%d is a leap year.", year);
    } else
        printf("%d is not a leap year.", year);

    return 0;
}

2) 

#include <stdio.h>
 void main()
{
 int num1, num2, num3;
 printf("Enter the values of num1, num2 and num3\n");
  
  scanf("%d %d %d", &num1, &num2, &num3);

    printf("num1 = %d\tnum2 = %d\tnum3 = %d\n", num1, num2, num3);

if (num1 > num2)
 {
 if (num1 > num3)
  {
printf("num1 is the max among three \n");
}
else
 {
printf("num3 is the max among three \n");
  }  }
    else if (num2 > num3)
printf("num2 is the max among three \n");
  else
        printf("num3 is the max among three \n");

3) #include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(){
    char str[100], ch;
    int i, grade[5];
    float credit[5], gpa=0.0, totCredit= 0.0;

    printf("Letter Grade and Credits for each subject: \n");

    for(i=0; i<5;i++){
        printf("Subject %d(Grade|Credit):",i+1);
        ch = getchar();
        grade[i]= ch;
        scanf("%f", &credit[i]);
        getchar();
    }
    printf("\nSubject | Grade |Credit\n");
    for(i=0; i<5;i++){
        printf(" %d | %c | %.0f\n ", i + 1, grade[i],credit[i]);

    }
    for(i=0; i<5;i++){
        switch(grade[i]){

            case 'A':
                gpa = gpa + 5 * credit[i];
                totCredit = totCredit + credit[i];
                break;
            case 'B':
                gpa = gpa + 4 * credit[i];
                totCredit = totCredit + credit[i];
                break;
            case 'C':
                gpa = gpa + 3 * credit[i];
                totCredit = totCredit + credit[i];
                break;
            case 'D':
                gpa = gpa + 2 * credit[i];
                totCredit = totCredit + credit[i];
                break;
            case 'F':
                gpa = gpa + 0 * credit[i];
                totCredit = totCredit + credit[i];
                break;
            default:
                printf("Given Wrong Grade !!\n");
                exit(0);


        }
    }
    printf("GPA: %f\tcredit: %f\n", gpa, totCredit);
    gpa = gpa /totCredit;
    printf("GPA for your score: %.2f\n",gpa);
    return 0;

}