Hello my name is amol sharma or vineet and this is my fifth part of learn coding with amol and in this part we are learning c language.

PART-5 c language

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💻 Complete C Language Guide

This guide covers the fundamentals of C programming with explanations and copyable examples.

1. Hello World

Basic structure of a C program.

#include <stdio.h>

int main() {

  printf("Hello, World!");

  return 0;

}

Variables store data values. C has types like int, float, char.

int age = 13;

float pi = 3.14;

char grade = 'A';

Use scanf to get user input.

int num;

printf("Enter a number: ");

scanf("%d", &num);

printf("You entered: %d", num);

Conditionally execute code blocks.

int x = 10;

if (x > 5) {

  printf("Greater than 5");

} else {

  printf("5 or less");

}

Repeat code using loops.

for (int i = 0; i < 5; i++) {

  printf("%d\\n", i);

}

int j = 0;

while (j < 5) {

  printf("%d\\n", j);

  j++;

}

Functions help organize reusable code.

void greet() {

  printf("Hello from a function!");

}

int main() {

  greet();

  return 0;

}

Arrays store multiple values of the same type.

int numbers[3] = {1, 2, 3};

printf("%d", numbers[0]);

Variables that store memory addresses.

int x = 10;

int *ptr = &x;

printf("%d", *ptr);

User-defined data types to group variables.

struct Person {

  char name[20];

  int age;

};

struct Person p1 = {"Amol", 13};

printf("%s", p1.name);

Read and write files using FILE pointers.

FILE *f = fopen("data.txt", "w");

fprintf(f, "Hello, File!");

fclose(f);

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