C编程基础-基础篇 8

#include <stdio.h>
#include <string.h>

int main() {
    char a[100] = "Welcome to our wiki!";
    char b[] = "It is a interest place.";
    char c[100] = "";

    printf("string length = %lu\n", strlen(a));
    printf("Compare a to a : %d\n", strcmp(a, a));

    printf("Before copy : %s\n", c);
    strcpy(c, a);
    printf("After copy : %s\n", c);

    char *pchar;
    pchar = strchr(a, 'o');
    printf("Character : %s\n", pchar);

    pchar = strstr(a, "our");
    printf("String : %s\n", pchar);

    return 0;
}

string length = 20
Compare a to a : 0
Before copy : 
After copy : Welcome to our wiki!
Character : ome to our wiki!
String : our wiki!

#include <stdio.h>

int main() {
    int *a, b = 100, *c;
    printf("a value = %p, a address = %p, a point value = %d\n", a, &a, *a);
    printf("b value = %d, b address = %p\n", b, &b);

    a = &b;
    printf("a value = %p, a address = %p, a point value = %d\n", a, &a, *a);

    c = a;
    printf("c value = %p, c address = %p, c point value = %d\n", c, &c, *c);
    printf("b value = %d, b address = %p\n", b, &b);
    return 0;
}