指针与一维数组:
指针存储的是变量的地址.
示例程序:
#include <stdio.h>
void main(){
int arr[] = {12, 15, 16};
int *p = arr;
p++;
printf("%d", *p);
}
示例程序:
#include <stdio.h>
void main(){
int arr[] = {12, 15, 16};
int *p = arr;
*(p+1) = 17;
p++;
printf("%d", *p);
}
动态分配内存:
示例程序:
#include <stdio.h>
#include <stdlib.h>
int main(){
int *p;
p = malloc(sizeof(*p));
if(p == NULL){
return -1;
}
*p = 100;
printf("%d", *p);
free(p);
return 0;
}
示例程序:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void *fun(char *p, int i){
p = malloc(i);
strcpy(p, "hello");
return p;
}
int main(){
char *p = NULL;
int i=32;
p = fun(p, i);
printf("%s", p);
free(p);
}