scanf และข้อมูลเข้า

#include <stdio.h>
int main(void) {
    int x = 0;
    /* scanf("%d", &x); */
    x = 5;
    printf("x = %d\n", x);
    return 0;
}

#include <stdio.h>
int main(void) {
    int x = 42;
    int *p = &x;
    printf("value via address = %d\n", *p);
    return 0;
}

#include <stdio.h>
int main(void) {
    int n;
    /* scanf("%d", &n); */
    n = 7;
    printf("You entered %d\n", n);
    return 0;
}

#include <stdio.h>
int main(void) {
    double d;
    /* scanf("%lf", &d); */
    d = 3.14;
    printf("d = %.2f\n", d);
    return 0;
}

#include <stdio.h>
int main(void) {
    int a, b;
    /* scanf("%d %d", &a, &b); */
    a = 3; b = 4;
    printf("sum = %d\n", a + b);
    return 0;
}

#include <stdio.h>
int main(void) {
    char c;
    /* scanf(" %c", &c); */
    c = 'X';
    printf("char = %c\n", c);
    return 0;
}

#include <stdio.h>
int main(void) {
    char word[20];
    /* scanf("%s", word); */
    word[0] = 'H'; word[1] = 'i'; word[2] = 0;
    printf("word = %s\n", word);
    return 0;
}

#include <stdio.h>
int main(void) {
    int n = 5;
    int read = 1; /* pretend scanf returned 1 */
    if (read == 1)
        printf("got %d\n", n);
    return 0;
}

#include <stdio.h>
int main(void) {
    char c = 'Y';
    printf("Reading with \" %%c\" skips spaces\n");
    printf("c = %c\n", c);
    return 0;
}

#include <stdio.h>
int main(void) {
    int value = 10;
    int ok = 1;
    if (ok)
        printf("valid: %d\n", value);
    else
        printf("invalid input\n");
    return 0;
}

#include <stdio.h>
int main(void) {
    int age;
    printf("Enter age: ");
    /* scanf("%d", &age); */
    age = 20;
    printf("Next year you will be %d\n", age + 1);
    return 0;
}