CodeBlanks Logo Icon CodeBlanks
Login Register

Putting it together

  • C course
  • Intermediate
  • Lesson 46/116
  • 6 min

Combine the quiz functions with a console menu.

Putting it together

The final lesson defines the run_quiz_app function. This function gathers the whole quiz flow in one place: greeting, question adding, running, percentage and a farewell message.

Signature: void run_quiz_app(void). Body: starts with printf("Quiz hazır\n");; declares struct Question questions[10]; int count = 0;; adds 2 questions with add_question; prints printf("%d soru eklendi\n", count);; calls run_quiz and print_percentage; finally prints printf("Tamamlandı\n");. The main body becomes run_quiz_app(); return 0;. The previous lesson's solution is in the starting code.

Practice Write the run_quiz_app function

Write void run_quiz_app(void). In the body, in order: printf("Quiz hazır\n");, struct Question questions[10]; int count = 0;, two add_question calls ("Başkent?", 0 and "2+2?", 1), printf("%d soru eklendi\n", count);, int score = run_quiz(questions, count);, printf("Skor: %d\n", score);, print_percentage(score, count);, printf("Tamamlandı\n");. Make main's body run_quiz_app(); return 0;.

Starter code

main.c
#include <stdio.h>
#include <string.h>

struct Question {
    char text[64];
    int correct;
};

void add_question(struct Question *q, int *count, const char *text, int correct) {
    strcpy(q[*count].text, text);
    q[*count].correct = correct;
    (*count)++;
}

int run_quiz(struct Question *q, int count) {
    int answers[3] = {0, 1, 2};
    int score = 0;
    for (int i = 0; i < count; i++) {
        printf("Soru %d: %s\n", i + 1, q[i].text);
        if (answers[i] == q[i].correct) {
            score++;
        }
    }
    return score;
}

void print_percentage(int score, int count) {
    int pct = score * 100 / count;
    printf("Yüzde: %d%%\n", pct);
}

// Write the run_quiz_app function: move the whole flow into it
// Add "Tamamlandı" at the end
// Replace main body with a run_quiz_app call

int main(void) {
    struct Question questions[10];
    int count = 0;
    add_question(questions, &count, "Başkent?", 0);
    add_question(questions, &count, "2+2?", 1);
    printf("%d soru eklendi\n", count);
    int score = run_quiz(questions, count);
    printf("Skor: %d\n", score);
    print_percentage(score, count);
    return 0;
}

Sample solution

main.c
#include <stdio.h>
#include <string.h>

struct Question {
    char text[64];
    int correct;
};

void add_question(struct Question *q, int *count, const char *text, int correct) {
    strcpy(q[*count].text, text);
    q[*count].correct = correct;
    (*count)++;
}

int run_quiz(struct Question *q, int count) {
    int answers[3] = {0, 1, 2};
    int score = 0;
    for (int i = 0; i < count; i++) {
        printf("Soru %d: %s\n", i + 1, q[i].text);
        if (answers[i] == q[i].correct) {
            score++;
        }
    }
    return score;
}

void print_percentage(int score, int count) {
    int pct = score * 100 / count;
    printf("Yüzde: %d%%\n", pct);
}

void run_quiz_app(void) {
    printf("Quiz hazır\n");
    struct Question questions[10];
    int count = 0;
    add_question(questions, &count, "Başkent?", 0);
    add_question(questions, &count, "2+2?", 1);
    printf("%d soru eklendi\n", count);
    int score = run_quiz(questions, count);
    printf("Skor: %d\n", score);
    print_percentage(score, count);
    printf("Tamamlandı\n");
}

int main(void) {
    run_quiz_app();
    return 0;
}

Expected output

Quiz hazır
2 soru eklendi
Soru 1: Başkent?
Soru 2: 2+2?
Skor: 2
Yüzde: 100%
Tamamlandı

Project complete

You've completed the five-lesson quiz app project. You started from the first lesson's skeleton; added the add_question, run_quiz and print_percentage functions; and finally combined them with run_quiz_app.

This structure is the foundation of real C projects: a data model (struct Question), layered functions and an integration point. In the next group you'll write and read data to disk with file I/O; this will let you persist quiz questions. The code you accumulated will serve as a skeleton for upcoming projects.

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What's the role of run_quiz_app?

  • Add questions
  • Compute score
  • Open a file
  • Combine the whole flow Correct answer

Explanation: run_quiz_app combines the whole quiz flow in one function.

2 Match functions to role

Term Meaning
add_question Add questions
run_quiz Run the quiz
print_percentage Print percentage
run_quiz_app Whole flow

3 Complete the run_quiz_app call

Question 
int main(void) {
    ____();
    return 0;
}
Answer 
int main(void) {
    run_quiz_app();
    return 0;
}

Explanation: main calls the run_quiz_app function.

All lessons in Intermediate

1 Advanced pointers

  1. Pointer to pointer
  2. Array of pointers
  3. Function pointers
  4. Function pointer parameter
  5. void pointer
  6. Summary - Advanced pointers

2 Memory management

  1. Dynamic array
  2. Resize with realloc
  3. Memory leaks
  4. Dangling pointers
  5. Allocation patterns
  6. Summary - Memory management

3 Project: Helper library

  1. Module design
  2. String helpers
  3. Number helpers
  4. Array helpers
  5. Putting it together

4 Advanced string handling

  1. Dynamic strings
  2. String concatenation
  3. String search
  4. String conversion
  5. String safety
  6. Summary - Advanced strings

5 Function pointers

  1. Function pointer definition
  2. Calling function pointers
  3. qsort
  4. Callback patterns
  5. Function pointer array
  6. Summary - Function pointers

6 Advanced structs

  1. Structs and pointers
  2. Dynamic struct
  3. Struct and function
  4. Nested structs
  5. Array of structs
  6. Summary - Advanced structs

7 Unions and enums

  1. union
  2. enum
  3. Struct and union
  4. typedef enum
  5. Bit fields
  6. Summary - Unions and enums

8 Project: Quiz app

  1. Quiz model
  2. Adding questions
  3. Running the quiz
  4. Score calculation
  5. Putting it together

9 File I/O

  1. FILE and fopen
  2. fprintf and fscanf
  3. fgets and fputs
  4. fclose
  5. fread and fwrite
  6. Summary - File I/O

10 Error handling

  1. errno
  2. perror
  3. strerror
  4. assert
  5. Error return values
  6. Summary - Error handling

11 Multi-file projects

  1. Headers and sources
  2. extern
  3. static
  4. Makefile basics
  5. Multiple modules
  6. Summary - Multi-file

12 Project: Library app

  1. Model design
  2. Library module
  3. Checking out
  4. Search and filter
  5. Putting it together

13 Dynamic data structures

  1. Linked list
  2. Adding to list
  3. Traversing list
  4. Deleting from list
  5. Stack and queue
  6. Summary - Dynamic data

14 Variable arguments

  1. stdarg.h
  2. va_start and va_end
  3. printf-like function
  4. vsnprintf
  5. Variadic patterns
  6. Summary - Variable arguments

15 Standard library

  1. stdlib.h
  2. string.h
  3. math.h
  4. time.h
  5. ctype.h
  6. Summary - Standard library

16 Command-line arguments

  1. argc and argv
  2. Argument processing
  3. getopt
  4. Argument validation
  5. Exit codes
  6. Summary - Command line

17 Debugging

  1. gdb basics
  2. Breakpoints
  3. Watch and print
  4. valgrind
  5. printf debugging
  6. Summary - Debugging

18 Advanced bitwise

  1. Bit masking
  2. Set and clear bits
  3. Bit shifting
  4. Bit hacks
  5. Pack and unpack
  6. Summary - Advanced bitwise

19 Advanced typedef

  1. typedef and struct
  2. typedef and function pointer
  3. typedef and array
  4. Opaque types
  5. typedef and enum
  6. Summary - Advanced typedef

20 Intermediate final

  1. Project design
  2. Data model
  3. Functional logic
  4. File I/O
  5. Putting it together