[英]Return Struct from Function in C
I'm very new to langage C and I need to make a lot of matrix calculation and I decided to use a matrix struct. 我是C语言的新手,我需要进行大量的矩阵计算,因此决定使用矩阵结构。
Matrix.h Matrix.h
struct Matrix
{
unsigned int nbreColumns;
unsigned int nbreRows;
double** matrix;
};
struct Matrix CreateNewMatrix(unsigned int n,unsigned int m);
double GetMatrixValue(struct Matrix* m,unsigned int ligne,unsigned int colonne);
Matrix.c Matrix.c
#include "matrix.h"
struct Matrix CreateNewMatrix(unsigned int n,unsigned int m){
struct Matrix mat;
mat.nbreColumns = n;
mat.nbreRows = m;
mat.matrix = (double**)malloc(n * sizeof(double*));
unsigned int i;
for(i = 0; i < n; i++)
{
mat.matrix[i] = (double*)calloc(m,sizeof(double));
}
return mat;
}
double GetMatrixValue(struct Matrix* m,unsigned int ligne,unsigned int colonne){
return m->matrix[ligne][colonne];
}
Then I compile, no errors ... 然后我编译,没有错误...
I made a few tests : 我做了一些测试:
Main.c MAIN.C
struct Matrix* m1 = CreateNewMatrix(2,2);
printf("Valeur : %f",GetMatrixValue(m1,1,1));
Edit : When I run my code, I had ".exe has stop working" ..
编辑:当我运行我的代码时,我有“ .exe已停止工作” ..
What did i do wrong ?
我做错了什么 ?
CreateNewMatrix
returns a Matrix
not a Matrix*
CreateNewMatrix
返回一个Matrix
而不是一个Matrix*
struct Matrix* m1 = CreateNewMatrix(2,2);
printf("Valeur : %f",GetMatrixValue(m1,1,1));
should be 应该
struct Matrix m1 = CreateNewMatrix(2,2);
printf("Valeur : %f",GetMatrixValue(&m1,1,1));
You should compile with all warnings on and not run the program until all the warnings go away. 您应该编译所有警告,并且在所有警告消失之前不要运行程序。
You declare CreateNewMatrix
to return a struct: 您声明
CreateNewMatrix
返回一个结构:
struct Matrix CreateNewMatrix(unsigned int n,unsigned int m){
But when you use it you expect a pointer to a struct: 但是当您使用它时,您会期望指向结构的指针:
struct Matrix* m1 = CreateNewMatrix(2,2);
This should be a compiler error, though. 但是,这应该是编译器错误。
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