Standard Library Functions
Understanding C Standard Library Functions and Headers
Introduction to Standard Library (स्टैंडर्ड लाइब्रेरी का परिचय)
C standard library pre-defined functions का collection है जो common programming tasks को perform करने में help करता है। ये functions different header files में organized होते हैं।
The C standard library is a collection of pre-defined functions that help perform common programming tasks. These functions are organized in different header files.
Key Points (मुख्य बिंदु):
- Standard library functions ready-made solutions provide करते हैं
- Standard library functions provide ready-made solutions
- Functions को use करने के लिए appropriate header file include करना important है
- Including appropriate header file is important to use functions
- Standard library functions efficient और well-tested होते हैं
- Standard library functions are efficient and well-tested
stdio.h Functions (stdio.h फंक्शन्स)
Input/Output functions और उनका use:
Input/Output functions and their usage:
#include
// Input functions
int num;
scanf("%d", &num);
// Output functions
printf("Number: %d\n", num);
// File operations
FILE *fp = fopen("file.txt", "w");
fprintf(fp, "Hello World\n");
fclose(fp); | Function (फंक्शन) | Description (विवरण) |
|---|---|
| printf() | Formatted output print करता है |
| printf() | Prints formatted output |
| scanf() | Formatted input read करता है |
| scanf() | Reads formatted input |
stdlib.h Functions (stdlib.h फंक्शन्स)
General purpose functions और उनका use:
General purpose functions and their usage:
#include
// Memory allocation
int *arr = (int*)malloc(10 * sizeof(int));
free(arr);
// Type conversion
char str[] = "123";
int num = atoi(str);
// Random numbers
srand(time(NULL));
int random = rand() % 100; Common Functions (कॉमन फंक्शन्स):
- malloc() और free() memory management के लिए
- malloc() and free() for memory management
- atoi(), atof() string से number conversion के लिए
- atoi(), atof() for string to number conversion
- rand() और srand() random numbers generate करने के लिए
- rand() and srand() for generating random numbers
string.h Functions (string.h फंक्शन्स)
String manipulation functions और उनका use:
String manipulation functions and their usage:
#include
// String operations
char str1[20] = "Hello";
char str2[20] = "World";
strcat(str1, str2); // Concatenation
strcpy(str2, str1); // Copy
int len = strlen(str1); // Length
int cmp = strcmp(str1, str2); // Comparison math.h Functions (math.h फंक्शन्स)
Mathematical functions और उनका use:
Mathematical functions and their usage:
#include
// Mathematical operations
double x = 2.0;
double y = sqrt(x); // Square root
double z = pow(x, 3); // Power
double a = sin(x); // Sine
double b = log(x); // Logarithm Best Practices (सर्वोत्तम प्रथाएं)
Standard library functions के best practices:
Best practices for standard library functions: