scanf sample code

scanf can be used in very complicated ways.

#include <stdio.h>

void one() {
  int a, b;
  printf("Input: ");
  scanf("%dxx%d", &a, &b);
  printf("a = %d, b = %d\n", a, b);
}

void two() {
  char array[] = {'a', 'b', '\0'};
  printf("array: %s\n", array);
  printf("Input: ");
  scanf("%2c", array);
  printf("Result: %s\n", array);
}

void three() {
  int result;
  printf("Input: ");
  scanf("%2d", &result);
  printf("result: %d\n", result);
}

void four() {
  char str[80];
  int i;

  printf("Enter your family name: ");
  scanf("%s", str);
  printf("Enter your age: ");
  scanf("%d", &i);
  printf("Mr. %s, %d years old.\n", str, i);
  printf("Enter a hexadecimal number: ");
  scanf("%x", &i);
  printf("You have entered %#x (%d).\n", i, i);
}

void five() {
  char str[10];
  printf("Input a string: ");
  scanf("%5s", str);
  printf("result: %s\n", str);
}

void six() {
  char c;
  printf("Input a character: ");
  scanf("%c%*[^\n]", &c);
  printf("The character: %c\n", c);
}

void seven() {
  int i = 0;
  printf("Input: ");
  scanf("%*[^0-9] %d", &i);
  printf("i: %d\n", i);
}

int main(int argc, const char *argv[]) {
  seven();
  return 0;
}