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Debugging Techniques in C

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Introduction

Debugging is the process of finding and fixing errors (bugs) in a program.

👉 It helps ensure the program runs correctly and efficiently.

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Types of Errors in C

• ✔ Syntax Errors
• ✔ Runtime Errors
• ✔ Logical Errors

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1. Using printf() for Debugging

👉 Print variable values to track execution

#include <stdio.h>

int main() {
    int a = 5, b = 0;

    printf("a = %d, b = %d\n", a, b);

    int c = a / (b + 1);

    printf("c = %d", c);

    return 0;
}

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Output

a = 5, b = 0
c = 5

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2. Using Debuggers (gdb)

👉 Step-by-step execution

Commands:

• break → set breakpoint
• run → start program
• next → next line
• print → show value

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3. Checking Logic Errors

👉 Verify program logic carefully

if (a = 5)   // ❌ Wrong
if (a == 5)  // ✔ Correct

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4. Using Comments

👉 Disable parts of code to test

// printf("Debug line");

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5. Boundary Testing

👉 Test edge cases

Example:

• 0
• Negative numbers
• Large values

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Debugging Techniques Table

Technique	Purpose
printf()	Track values
Debugger	Step execution
Logic Check	Fix conditions
Comments	Test parts

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Important Notes

• Debug step-by-step
• Check all inputs
• Test edge cases

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Common Mistakes

• ❌ Ignoring warnings
• ❌ Not testing edge cases
• ❌ Skipping logic checks

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Pro Tips

• ✔ Use debugger tools
• ✔ Write clean code
• ✔ Test regularly
• ✔ Understand error messages

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Conclusion

Debugging is an essential skill for every programmer. It helps identify and fix errors effectively.

Master debugging to write error-free programs.

👉 This article is part of Dharani Tech Edu Hub — where learning programming is made simple and practical.