C is a general-purpose programming language that has been used for developing operating systems, embedded systems, and other applications. Here’s a quick overview of its unique features and some code blocks for common tasks.
Declare variables using the data type followed by the variable name. C is a statically typed language, so the data type of a variable cannot be changed after it is declared.
int x = 10;
char c = 'a';
float f = 3.14;
Functions in C are declared using the function keyword. They can take parameters and return values.
int add(int a, int b) {
return a + b;
}
C supports for, while, and do-while loops for iterating over arrays or performing a task a certain number of times.
int numbers[] = {1, 2, 3, 4, 5};
for (int i = 0; i < 5; i++) {
printf("%d\n", numbers[i]);
}
int i = 0;
while (i < 5) {
printf("%d\n", numbers[i]);
i++;
}
i = 0;
do {
printf("%d\n", numbers[i]);
i++;
} while (i < 5);
Use if statements to execute code based on a condition. else if and else statements can be used to handle multiple conditions.
int x = 10;
if (x > 0) {
printf("x is positive");
} else if (x < 0) {
printf("x is negative");
} else {
printf("x is zero");
}
C provides built-in support for file manipulation, including reading and writing files, and interacting with the file system.
#include <stdio.h>
int main() {
FILE *fp;
char buffer[255];
fp = fopen("/path/to/file.txt", "r");
fgets(buffer, 255, fp);
printf("%s", buffer);
fclose(fp);
fp = fopen("/path/to/file.txt", "w");
fputs("New contents", fp);
fclose(fp);
if (remove("/path/to/file.txt") == 0) {
printf("File deleted successfully");
} else {
printf("Error deleting file");
}
return 0;
}
Here are some resources to help you learn more about C: