[閒聊] 二維陣列傳遞的方法

[PanJC ((#‵Д′)f〒﹌﹌﹌﹌﹌ꄩ]

#include <stdio.h>
#include <stdlib.h>

void f1(float (*a)[2], int m, int n);
void f2(float **a, int m, int n);
void f3(float (*a)[2], int m);
void f4(float a[][2], int m);
int main(){
        float z[4][2] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0};
        printf("&z: %p\n",&z);
        printf("&z[0]: %p\n",&z[0]);
        printf("&z[0][0]: %p\n",&z[0][0]);

        printf("z: %p\n",z);
        printf("z+1: %p\n",z+1);
        f1(z, 4, 2);

        float **b;
        b = (float **)malloc(4*sizeof(float *));
        *b = (float *)malloc(4*2*sizeof(float));
        int i,j ;
        for( i = 0; i < 4 ; i++)
                *(b+i) = *b + 2*i;

        printf("\nf1:\n");
        for( i = 0 ; i < 4 ; i++ ){
                for( j = 0 ; j < 2 ; j++ ){
                        b[i][j]=z[i][j];
                }
        }
        f2(b, 4, 2);
        free(*b);
        free(b);

        float **c;
        c = (float **)malloc(4*sizeof(float *));
        printf("\nf2:\n");
        for( i = 0 ; i < 4 ; i++  )
                *(c+i)=z[i];
        f2(c, 4, 2);
        free(c);

        printf("\nf3:\n");
        f3(z,4);
        printf("\nf4:\n");
        f4(z,4);
}
void f4(float a[][2], int m){
        int i,j;
        int n;
        n = sizeof(a[0])/sizeof(a[0][0]);
        printf("n = %d\n",n);
        for( i = 0 ; i < m ; i++ ){
                for( j = 0 ; j < n ; j++ ){
                        printf("%f\t", a[i][j]);
                }
                printf("\n");
        }
}

void f3(float (*a)[2], int m){
        int i,j;
        int n;
        n = sizeof(a[0])/sizeof(a[0][0]);
        printf("n = %d\n",n);
        for( i = 0 ; i < m ; i++ ){
                for( j = 0 ; j < n ; j++ ){
                        printf("%f\t", a[i][j]);
                }
                printf("\n");
        }
}

void f2(float **a, int m, int n){
        int i,j;
        for( i = 0 ; i < m ; i++ ){
                for( j = 0 ; j < n ; j++ ){
                        printf("%f\t", a[i][j]);
                }
                printf("\n");
        }
}

void f1(float (*a)[2], int m, int n){
        int i,j;
        for( i = 0 ; i < m ; i++ ){
                for( j = 0 ; j < n ; j++ ){
                        printf("%f\t", a[i][j]);
                }
                printf("\n");
        }
}


--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 140.113.7.248