分段故障 - 矩阵的转置 - C(Segmentation Fault - Transpose of a Matrix - C)

 我在以下代码上有分段错误错误： 
 
struct matrix {
int nl, nc ;
int** mat ;
};

 Matrix* initMatrix (int nlines, int ncol) {
    struct matrix* mat ;
    mat = (struct matrix*)malloc(sizeof(struct matrix)) ;
    mat->nl = nlines ;
    mat->nc = ncol ;
    int i ;
    mat->mat = (int **)malloc((mat->nl)*sizeof(int *)) ;
    for (i=0;i<(mat->nl); i++) {
        mat->mat[i] = (int*)malloc((mat->nc)*sizeof(int)) ; 
    }
    return mat ;
}   

Matrix* transp (Matrix* mat) {
    int i, j;
    int linesTrp = mat->nc ;
    int colTrp = mat->nl ;
    Matrix* trp = initMatrix (linesTrp, colTrp) ;   
    for (i=0; i<(linesTrp); i++) {
        for (j=0; j<(colTrp); j++) {        
            trp->mat[j][i] = mat->mat[i][j] ;
        }
    }
    return trp;
}
 
 显然，程序在到达此行时会给出分段错误消息： 
 
for (j=0; j<(colTrp); j++) {
 
 如果有人可以帮助我，我将不胜感激。 对不起最后的坏英语（我来自巴西） 

I have a segmentation fault error on the following code: 
 
struct matrix {
int nl, nc ;
int** mat ;
};

 Matrix* initMatrix (int nlines, int ncol) {
    struct matrix* mat ;
    mat = (struct matrix*)malloc(sizeof(struct matrix)) ;
    mat->nl = nlines ;
    mat->nc = ncol ;
    int i ;
    mat->mat = (int **)malloc((mat->nl)*sizeof(int *)) ;
    for (i=0;i<(mat->nl); i++) {
        mat->mat[i] = (int*)malloc((mat->nc)*sizeof(int)) ; 
    }
    return mat ;
}   

Matrix* transp (Matrix* mat) {
    int i, j;
    int linesTrp = mat->nc ;
    int colTrp = mat->nl ;
    Matrix* trp = initMatrix (linesTrp, colTrp) ;   
    for (i=0; i<(linesTrp); i++) {
        for (j=0; j<(colTrp); j++) {        
            trp->mat[j][i] = mat->mat[i][j] ;
        }
    }
    return trp;
}
 
Apparently, the program gives me the segmentation fault message when it reaches this line: 
 
for (j=0; j<(colTrp); j++) {
 
Please, if anyone can help me, I would appreciate. Also, sorry for eventual bad english (I'm from Brazil)

原文：https://stackoverflow.com/questions/19757081