074256_3.cpp

一个用c语言写的一个矩阵加减乘的小程序。里面有具体的使用方法

//074256_3.cpp  : To input or output a Matrix

#include"074256_1.h"

//fuction : read_matrix -----------------------------------------------------------
//To input a matrix from the keyboard

int **read_matrix(int row,int col)
{
	int i=0;
	int j=0;
	int ok=0;
	int **p_mat;

	p_mat=(int **)malloc(row*sizeof(int *));       //allocate memory for Matrix
	if(p_mat==NULL)
	{
		printf("\t\tNo enough memory!\n");
		exit(1);
	}
	for(i=0;i<row;i++)
	{
		p_mat[i]=(int *)malloc(col*sizeof(int));
		if(p_mat[i]==NULL)
		{
			printf("\t\tNo enough memory!\n");
			exit(1);
		}
	}
	printf("\tPlease input the Matrix:\n");

	for(i=0;i<row;i++)      //input Matrix
	{   
		printf("\t");
		for(j=0;j<col;j++)
		{
			ok=scanf("%d",&p_mat[i][j]); 
			if(!ok)                            //judje if the input is reasonable
			{
				clean();
				printf("\n\t-------> Bad Data!\n");
				printf("\t\tPlease input a digit ( an intager ) !\n\n\t");
				break;
			}
		}
		if(!ok)
		{
			printf("Please input the Matrix again:\n\t");
			i=-1;
			j=0;
		}
	}
	printf("\n");

	return(p_mat);
}


//fuction : print_matrix  -------------------------------------------------------------------
//To print a Matrix to the screen

void print_matrix(int **p_mat,int row,int col)
{
	int i=0;
	int j=0;
	for(i=0;i<row;i++)
	{
		printf("\t\t");
		for(j=0;j<col;j++)
			printf("%d\t",p_mat[i][j]);
		printf("\n\n");
	}
}