C语言指针

#include 
#include 
#include 

void initData(int *p,int length);
void printData(int *p,int length);
void printData2(int length,int a[length]);
int main(){
    int a[5];
    int *p = a;
    int length = sizeof(a)/sizeof(a[0]);
    initData(a,length);
    printData(a,length);

    putchar('n');
    puts("3===================================================");
    p = a;
    for (int i = 0; i < length; i++)
    {
        printf("%-6d",p[i]);
    }

    printData2(length,a);

}

void initData(int *p,int length){
    srand((unsigned)time(NULL));
    for (int i = 0; i < length; i++)
    {
        *(p + i) = rand()%50;
    }
    
}

void printData(int *p,int length){
    puts("1===================================================");
    for (int i = 0; i < length; i++)
    {
        printf("%-6d",*(p+ i));
    }

    putchar('n');
    puts("2===================================================");
    for (int i = 0; i < length; i++)
    {
        printf("%-6d",*p++);
    }
}

void printData2(int length,int a[length]){

    
    putchar('n');
    puts("4===================================================");

    for (int i = 0; i < length; i++)
    {
        printf("%-6d",*(a + i));
    }
}

运行结果

注意：p++后，下次用p记得重新复位。