This example prints "Hello, World!" to the console. It's a basic program that demonstrates the standard way to output text in C.
#include <stdio.h>
int main() {
printf("Hello, World!\n");
return 0;
}This function prints the minimum and maximum values for the built-in types: char, short, int, and long, using constants from the <limits.h> library.
#include <stdio.h>
#include <limits.h>
void print_ranges() {
printf("char: %d to %d\n", CHAR_MIN, CHAR_MAX);
printf("short: %d to %d\n", SHRT_MIN, SHRT_MAX);
printf("int: %d to %d\n", INT_MIN, INT_MAX);
printf("long: %ld to %ld\n", LONG_MIN, LONG_MAX);
}
int main() {
print_ranges();
return 0;
}This example demonstrates how to use the <stdio.h> library and the && and || operators to check if input was received and its length.
#include <stdio.h>
#include <string.h>
int main() {
char str[100];
if (fgets(str, sizeof(str), stdin) && strlen(str) > 0) {
printf("Input received: %s", str);
} else {
printf("No input received.\n");
}
return 0;
}This function converts a hexadecimal string (starting with 0x or 0X) to its integer equivalent.
#include <stdio.h>
#include <ctype.h>
int htoi(char s[]) {
int n = 0;
for (int i = 0; s[i] != '\0'; i++) {
char c = tolower(s[i]);
n *= 16;
if (c >= '0' && c <= '9') {
n += c - '0';
} else if (c >= 'a' && c <= 'f') {
n += c - 'a' + 10;
}
}
return n;
}
int main() {
printf("%d\n", htoi("0x1A3"));
return 0;
}This function removes characters from s1 that appear in s2, modifying the string s1 in place.
#include <stdio.h>
void squeeze(char s1[], char s2[]) {
int i, j, k;
for (i = j = 0; s1[i] != '\0'; i++) {
for (k = 0; s2[k] != '\0' && s1[i] != s2[k]; k++);
if (s2[k] == '\0') {
s1[j++] = s1[i];
}
}
s1[j] = '\0';
}
int main() {
char str1[] = "hello";
char str2[] = "aeiou";
squeeze(str1, str2);
printf("%s\n", str1);
return 0;
}This function returns the position of the first occurrence of any character from s2 in s1, or -1 if no match is found.
#include <stdio.h>
int any(char s1[], char s2[]) {
for (int i = 0; s1[i] != '\0'; i++) {
for (int j = 0; s2[j] != '\0'; j++) {
if (s1[i] == s2[j]) {
return i;
}
}
}
return -1;
}
int main() {
char str1[] = "hello";
char str2[] = "aeiou";
printf("First match at position: %d\n", any(str1, str2));
return 0;
}