C Program to print student examination result

Code:

#include<stdio.h>
struct info
{
    char name[20];
    int roll;
    float marks;
    int rank;
};
int main()
{
    struct info student1;
    printf("Enter the values: ");
    scanf("%s",student1.name);
    scanf("%d",&student1.roll);
    scanf("%f",&student1.marks);
    scanf("%d",&student1.rank);
    printf("Name: %s\n",student1.name);
    printf("Roll: %d\n",student1.roll);
    printf("Marks: %f\n",student1.marks);
    printf("Rank: %d\n",student1.rank);
    
    return 0;
}

Output:

Enter the values: Shahbaz
17
90
4
Name: Shahbaz
Roll: 17
Marks: 90.000000
Rank: 4

C Program to Add Two Distances (in inch-feet system) using Structures

Code:

#include <stdio.h>
struct Distance
{
   int x;
   float y;
} distance1, distance2, total;
int main()
{
   printf("Enter first distance\n");
   printf("Enter in feet: ");
   scanf("%d", &distance1.x);
   printf("Enter in inches: ");
   scanf("%f", &distance1.y);
   printf("\nEnter second distance\n");
   printf("Enter in feet: ");
   scanf("%d", &distance2.x);
   printf("Enter in inches: ");
   scanf("%f", &distance2.y);
   total.x = distance1.x + distance2.x;
   total.y = distance1.y + distance2.y;
   while (total.y >= 12.0) {
      total.y = total.y - 12.0;
      ++total.x;
   }
   printf("Sum of distance is %d\'-%.1f\n", total.x, total.y);
   return 0;
}

Output:

Enter first distance
Enter in feet: 5
Enter in inches: 8.8

Enter second distance
Enter in feet: 6
Enter in inches: 4.2
Sum of distance is 12'-1.0

C Program to Calculate Difference Between Two Time Periods

Code:

#include <stdio.h>
struct interval
{
   int sec;
   int min;
   int hrs;
};
void difference(struct interval t1, struct interval t2,struct interval *diff);
void difference(struct interval start,struct interval stop,struct interval *diff)
{
   while (stop.sec > start.sec)
   {
      --start.min;
      start.sec += 60;
   }
   diff->sec = start.sec - stop.sec;
   while (stop.min > start.min)
   {
      --start.hrs;
      start.min += 60;
   }
   diff->min = start.min - stop.min;
   diff->hrs = start.hrs - stop.hrs;
}
int main()
{
   struct interval startinterval, stopinterval, diff;
   printf("Enter the start interval. \n");
   printf("Enter hrs, min and sec: ");
   scanf("%d %d %d", &startinterval.hrs,
         &startinterval.min,
         &startinterval.sec);
   printf("Enter the stop interval. \n");
   printf("Enter hrs, min and sec: ");
   scanf("%d %d %d", &stopinterval.hrs,
         &stopinterval.min,
         &stopinterval.sec);
   difference(startinterval, stopinterval, &diff);
   printf("Interval Difference: %d:%d:%d - ", startinterval.hrs,
          startinterval.min,
          startinterval.sec);
   printf("%d:%d:%d ", stopinterval.hrs,
          stopinterval.min,
          stopinterval.sec);
   printf("= %d:%d:%d\n", diff.hrs,
          diff.min,
          diff.sec);
   return 0;
}

Output:

Enter the start interval. 
Enter hrs, min and sec: 5
32
15
Enter the stop interval. 
Enter hrs, min and sec: 9
45
52
interval Difference: 5:32:15 - 9:45:52 = -5:46:23

C Program to store and print details of stocks

Code:

#include<stdio.h>
struct invent
{
    char *name[15];
    int number;
    float price;
};
int main()
{
    struct invent product[3],*ptr;
    ptr = &product[3];
    printf("Enter the values: \n");
    scanf("%s", ptr->name);
    scanf("%d", &ptr->number);
    scanf("%f", &ptr->price);
    printf("Your entered value:\n");
    printf("Item name: %s\n",ptr->name);
    printf("Quantity: %d\n",ptr->number);
    printf("Price per item: %f\n",ptr->price);
    return 0;
}

Output:

Enter the values: 
Shirts
70
1200
Your entered value:
Item name: Shirts
Quantity: 70
Price per item: 1200.000000

C Program to Store Data in Structures Dynamically

Code:

#include <stdio.h>
#include <stdlib.h>
struct class
{
    int score;
    char subject[20];
};
int main()
{
    struct class *ptr;
    int i, j;
    printf("Enter the number of subjects: ");
    scanf("%d", &j);
    ptr = (struct class *)malloc(j * sizeof(struct class));
    for (i = 0; i < j; ++i)
    {
        printf("Enter the name of the subject:\n");
        scanf("%s", (ptr + i)->subject);
        printf("Enter the score:\n");
        scanf("%d", &(ptr + i)->score);
    }
    printf("Student Record:\n");
    for (i = 0; i < j; ++i)
        printf("%s:\t%d\n", (ptr + i)->subject, (ptr + i)->score);
    return 0;
}

Output:

Enter the number of subjects: 4
Enter the name of the subject:
English
Enter the score:
80
Enter the name of the subject:
Hindi
Enter the score:
40
Enter the name of the subject:
Maths
Enter the score:
90
Enter the name of the subject:
Computer
Enter the score:
85
Student Record:
English:  80
Hindi:    40
Maths:    90
Computer: 85