Advanced · C PROGRAMMING

Repair estimate mini project

What you will learn

Combine functions, structures and arrays in a small repair estimate.

Understand the concept

Each line item stores a name, quantity and unit price in paise. Integer paise avoids binary floating-point rounding for this small example. A function totals the array, and the program prints rupees and paise separately. Real billing also needs checked arithmetic and explicit tax and rounding rules.

Read the example

The complete program appears below. Read it first, predict the output, then run it.

Expected output

Estimate: INR 751.00

Practise

Print each line item before the total. Add a third item and verify the total by hand.

Common mistake

Validate quantities and prices before calculating. Large integer products can overflow; this educational example uses bounded constants.

Lesson discussion

#include <stdio.h>
struct Item { const char *name; int quantity; long unit_paise; };
long estimate(const struct Item *items, size_t count) {
    long total = 0;
    for (size_t i = 0; i < count; ++i) total += items[i].quantity * items[i].unit_paise;
    return total;
}

int main(void) {
    struct Item items[] = {{"Service", 1, 50000}, {"Part", 2, 12550}};
    long total = estimate(items, sizeof items / sizeof items[0]);
    printf("Estimate: INR %ld.%02ld\n", total / 100, total % 100);
    return 0;
}

PRACTICE LAB

Read. Edit. Run.

C source · .c

Experiment with the program below. Your code and input are sent to the selected compiler only when you run it.

Compiler

C source

Tab indents · Shift+Tab unindents · Esc then Tab leaves the editor · Ctrl/Cmd+Enter runs · Ctrl/Cmd+S saves a draft

Changes save automatically to your account.

Standard input

Input / output example

Example input

No input required.

Expected output for the original program

Estimate: INR 751.00

Output will appear here.

Repair estimate mini project

What you will learn

Understand the concept

Read the example

Expected output

Practise

Common mistake

Lesson discussion

Read. Edit. Run.

Input / output example

Debugging Lab

Interactive Memory Visualizer

Stack frames

Memory and pointers

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