【发布时间】:2016-10-28 22:06:26
【问题描述】:
我正在尝试使用链表在 C 中创建一个稀疏矩阵。我的教授给了file.h 结构、函数列表以及它们应该做什么,并告诉我们“使用它”。
要恢复一切,我的代码不起作用,当我尝试插入一个元素(调用 ins_elem())并在调用 soma_elem_coluna() 和 soma_elem_linha() 时返回奇怪的数字时它停止工作。
我已将整个代码放在下面,但问题确实存在于上面指定的函数中(以及soma_const(),因为我无法在不插入元素的情况下对其进行测试)。
我使用的逻辑是创建一个矩阵,如下图所示(使用数字而不是字符) [
别介意奇怪的打字,有些词是葡萄牙语。
(C = 列,L = 行)
这是我的file.h:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LINES 4
#define COLUM 4
typedef struct Node{
int Val, L, C;
struct Node *down, *right;
}Node;
typedef struct{
Node *L[LINES], *C[COLUM];
}matriz;
void cria_matriz(matriz* m); // creates matrix
void ins_elem(matriz* m, int e, int l, int c); // insert element e into lxc
void soma_const(matriz* m, int e, int l, int c); // add value e to existing lxc
int soma_elem_linha(matriz *m, int l); // sums all the values in row l
int soma_elem_coluna(matriz *m, int c); // sums all the values in column c
void imp(matriz *m); // prints the matrix
我的file.c
#include "file.h"
void cria_matriz(matriz* m)
{
int i;
for(i=0;i<LINES;i++) //initializes headrows
{
m->L[i]->down = NULL;
m->L[i]->right = NULL;
m->L[i]->C = -1;
m->L[i]->L = -1;
}
for(i=0;i<COLUM;i++) //initializes headcolumns
{
m->C[i]->down = NULL;
m->C[i]->right = NULL;
m->C[i]->C = -1;
m->C[i]->L = -1;
}
}
void ins_elem(matriz *m, int e, int l, int c)
{
Node* auxLine; // move through row
Node* auxCol; // move through column
auxLine = &m->L[l];
auxCol = &m->C[c];
while(auxLine->right != NULL && auxLine->right->C < c) //find correct pos in row
{
auxLine = auxLine->right;
}
while(auxCol->down != NULL && auxCol->down->L < c) //find correct pos in column (error happens here)
{
auxCol = auxCol->down;
}
Node* novo = malloc(sizeof(Node));
novo->Val = e;
novo->C = c;
novo->L = l;
novo->down = auxCol->down;
auxCol->down = novo;
novo->right = auxLine->right;
auxLine->right = novo;
}
void soma_const(matriz *m, int e, int l, int c)
{
Node* aux = &m->C[c];
while(aux->down != NULL && aux->L < l)
aux = aux->down;
aux->Val+=e;
}
int soma_elem_coluna(matriz *m, int c)
{
int sum = 0;
Node* aux = &m->C[c];
if(aux->down == NULL)
return 0;
while(aux->down != NULL)
{
aux = aux->down;
sum += aux->Val;
}
return sum;
}
int soma_elem_linha(matriz *m, int l)
{
int sum = 0;
Node* aux = &m->L[l];
if(aux->right == NULL)
return 0;
while(aux->right != NULL)
{
aux = aux->right;
sum += aux->Val;
}
return sum;
}
void imp(matriz *m)
{
Node* aux;
int i, j;
for(i=0;i<LINES;i++)
{
aux = &m->L[i];
for(j=0;j<COLUM;j++)
{
if(aux->C == j)
{
printf("%d ",aux->Val);
aux = aux->right;
}
else
{
printf("0 ");
}
}
printf("\n");
}
}
我的main.c:
#include "file.h"
int main()
{
struct matriz* M = (matriz*)malloc(sizeof(matriz));
int i,e,c,l,result;
char str[20];
for(i=0;i<5;i++) // this is temporary and another issue, how I make a while that
{ // only stops when user (a bot actually) presses enter?
scanf(" %s",str);
if(!strcmp(str,"cria_matriz"))
{
cria_matriz(M);
}
else if(!strcmp(str,"ins_elem"))
{
scanf("%d %d %d",&e,&l,&c);
ins_elem(M,e,l,c);
}
else if(!strcmp(str,"soma_const"))
{
scanf("%d %d %d",&e,&l,&c);
soma_const(M,e,l,c);
}
else if(!strcmp(str,"soma_elem_linha"))
{
scanf("%d",&l);
result = soma_elem_linha(M,l);
printf("%d\n",result);
}
else if(!strcmp(str,"soma_elem_coluna"))
{
scanf("%d",&c);
result = soma_elem_coluna(M,c);
printf("%d\n",result);
}
else if(!strcmp(str,"imp"))
{
imp(M);
}
}
return 0;
}
【问题讨论】:
-
没有人吗?已经3个小时了,还是修不出来……
-
目前还不清楚您的代码出了什么问题。您应该学习如何使用调试器。您的学习速度将提高 10 倍。
标签: c list matrix linked-list sparse-matrix