#include <stdio.h>
struct Distance
{
int feet;
float inch;
} d1, d2, sumOfDistances;
int main()
{
printf("Enter information for 1st distance\n");
printf("Enter feet: ");
scanf("%d", &d1.feet);
printf("Enter inch: ");
scanf("%f", &d1.inch);
printf("\nEnter information for 2nd distance\n");
printf("Enter feet: ");
scanf("%d", &d2.feet);
printf("Enter inch: ");
scanf("%f", &d2.inch);
sumOfDistances.feet = d1.feet+d2.feet;
sumOfDistances.inch = d1.inch+d2.inch;
// If inch is greater than 12, changing it to feet.
if (sumOfDistances.inch>12.0)
{
sumOfDistances.inch = sumOfDistances.inch-12.0;
++sumOfDistances.feet;
}
printf("\nSum of distances = %d\'-%.1f\"",sumOfDistances.feet, sumOfDistances.inch);
return 0;
}

Output

Enter information for 1st distance
Enter feet: 23
Enter inch: 8.6

Enter information for 2nd distance
Enter feet: 34
Enter inch: 2.4

Sum of distances = 57'-11.0"

In this program, a structure Distance is defined. The structure has two members inch (a float) and feet (an integer).

Two variables (d1 and d2) are created which stores two distances (in inch and feet). Then, the sum of two distances is stored in the sumOfDistances structure and displayed on the screen.

C program to add two distances (in inch-feet) system using structures:

#include <stdio.h>

struct Distance {
    int feet;
    float inch;
};

void add(struct Distance d1, struct Distance d2, struct Distance *result) {
    result->inch = d1.inch + d2.inch;
    result->feet = 0;
    if (result->inch >= 12.0) {
        result->inch -= 12.0;
        result->feet++;
    }
    result->feet += d1.feet + d2.feet;
}

int main() {
    struct Distance d1, d2, result;

    // Input for d1
    printf("Enter feet and inch for distance 1:\n");
    scanf("%d %f", &d1.feet, &d1.inch);

    // Input for d2
    printf("Enter feet and inch for distance 2:\n");
    scanf("%d %f", &d2.feet, &d2.inch);

    // Add the two distances
    add(d1, d2, &result);

    // Output
    printf("Sum = %d\'-%.1f\"", result.feet, result.inch);

    return 0;
}

Explanation:

• #include <stdio.h> includes the standard input-output header file in our program, which provides input and output operations functionality.
• struct Distance {...}; defines a structure named Distance which has two members: feet and inch.
• void add(struct Distance d1, struct Distance d2, struct Distance *result) {...} defines a function named add() which takes two distances as input and returns their sum as a distance. The result is stored in the third parameter result, which is a pointer to a Distance structure.
• int main() is the entry point of our program.
• struct Distance d1, d2, result; declares three variables d1, d2, and result of type Distance.
• The next four statements use printf() and scanf() to input the feet and inch values of the two distances.
• add(d1, d2, &result); calls the add() function and passes it the two distances as well as a pointer to the result structure.
• printf("Sum = %d\'-%.1f\"", result.feet, result.inch); prints the sum of the two distances using printf(). The %d format specifier is used to print the feet value as an integer, and %.1f is used to print the inch value with one decimal place. The backslash (\) before the single quote (') and double quote (") characters is an escape sequence to print those characters.

When we compile and run this program, it will prompt the user to input the feet and inch values of two distances and then display their sum in the same format.