Practice Problems On Structures And Unions

#include <stdio.h> Copy Code
// Define a structure to represent a student
struct Student {
char name[50];
int rollNumber;
float marks;
};

int main () {
// Declare an array of structures to store information about multiple students
struct Student students[3];

// Input information for each student
for ( int i = 0; i < 3; i++) {
printf ("Enter details for student %d: ", i + 1);

printf ("Name: ");
scanf ("%s", students[i].name);

printf ("Roll Number: ");
scanf ("%d", &students[i].rollNumber);

printf ("Marks: ");
scanf ("%f", &students[i].marks);

printf (" ");
}

// Display information for each student
printf ("Student Information: ");
for ( int i = 0; i < 3; i++) {
printf ("Student %d ", i + 1);
printf ("Name: %s ", students[i].name);
printf ("Roll Number: %d ", students[i].rollNumber);
printf ("Marks: %.2f ", students[i].marks);
printf (" ");
}

return 0;
}

#include <stdio.h> Copy Code
struct Time {
int hours, minutes, seconds;
};

struct Time timeDifference ( struct Time t1, struct Time t2) {
struct Time diff;
int totalSeconds1 = t1.hours * 3600 + t1.minutes * 60 + t1.seconds;
int totalSeconds2 = t2.hours * 3600 + t2.minutes * 60 + t2.seconds;
int differenceInSeconds = totalSeconds1 - totalSeconds2;
diff.hours = differenceInSeconds / 3600;
differenceInSeconds %= 3600;
diff.minutes = differenceInSeconds / 60;
diff.seconds = differenceInSeconds % 60;
return diff;
}

int main () {
struct Time time1, time2;
printf ("Enter first time (hours minutes seconds): ");
scanf ("%d %d %d", &time1.hours, &time1.minutes, &time1.seconds);

printf ("Enter second time (hours minutes seconds): ");
scanf ("%d %d %d", &time2.hours, &time2.minutes, &time2.seconds);

struct Time difference = timeDifference (time1, time2);
printf ("Time Difference: %d hours, %d minutes, %d seconds ",
difference.hours, difference.minutes, difference.seconds);

return 0;
}