fscanf() 显示意外行为

Question

我正在尝试读取 .txt 文件并将其转换为我之前已成功实现和测试的图形结构。我正在使用 fscanf 函数，因此读取特定值变得更容易。代码如下：

int readGraph(char* fileName, Graph* graph) {
FILE* filePointer;
int nodes, edges;

filePointer = fopen(fileName, "r");
if(!filePointer) {
    fprintf(stderr, "[READ-GRAPH] Unable to open file");
    return(0);
}

if(fscanf(filePointer, "%d %d", &nodes, &edges) != 2)
    return (0);
initialize(graph, nodes);

int fromNode, toNode;
Weight weight;
while((fscanf(filePointer, "%d %d %f", &fromNode, &toNode, &weight)) != EOF) {
    printf("fromNode value %d toNode value %d weight value %f\n", fromNode, toNode, weight);
    addEdge(graph, fromNode, toNode, weight);
}

fclose(filePointer);
return (1);}

int main() {

    Graph graph;
    readGraph((char*) filename, &graph);
    print(&graph);
}

每一行包含两个节点值和一个浮点权重（第一行除外，它包含所需的节点数和边数）。问题是，在阅读“grafo1.txt”时，我有时会得到垃圾值。此外，使用文件 'grafo.txt' 甚至还没有完成读取（它会打印到第 6 行，然后程序崩溃）。

grafo.txt:
4 7
0 3 6.3
2 1 5.0
2 0 9
1 3 1.7
0 1 9
3 1 5.6
0 2 7.2

grafo1.txt
5 4
1 3 5.3
3 2 2
1 2 7.8
4 3 6

grafo1.txt output
fromNode value 1 toNode value 3 weight value 5.300000
fromNode value 3 toNode value 2 weight value 2.000000
fromNode value 1 toNode value 2 weight value 7.800000
fromNode value 4 toNode value 3 weight value 6.000000
[PRINT] Node 0
Connections:
[PRINT] Node 1
Connections: 2 (weight 7.800000), 3 (weight 5.300000),
[PRINT] Node 2
Connections:
[PRINT] Node 3
Connections: 2 (weight -463590750420992.000000), <- Garbage value. Why?
[PRINT] Node 4
Connections: 3 (weight 6.000000),

grafo.txt output
fromNode value 0 toNode value 3 weight value 6.300000
fromNode value 2 toNode value 1 weight value 5.000000
fromNode value 2 toNode value 0 weight value 9.000000
fromNode value 1 toNode value 3 weight value 1.700000
<- it crashes after this blank line

我真的不明白为什么两个格式相同的 .txt 会给出不同的输出，还有：为什么只有一个能够几乎成功地创建图表？ （几乎是因为某个时候出于某种原因注册了垃圾值）。任何帮助表示赞赏，我正在努力学习关于 C 的一切。

Answer 1

正如 Jayr 指出的，问题与 readGraph 函数无关。谢谢你。