从文件读取并将其分配给int数组，但它在C中分配了一些不相关的负数

Question

下面的代码应该从文件中读取，并将找到的数字分配到二维数组中以对其进行操作。

    int newString[10][10];
    int i,j,ctr;
    FILE *fp;
    char line[256];
    fp = fopen("input.dat", "r");
    for( i = 0; i < 10 ; i++){
            for( j = 0; j < 10; j++){
                    newString[i][j] = 0;
            }
    }
    j = 0;
    ctr = 0;
    while (fgets(line, sizeof(line), fp) != NULL){

            for(i=0;i<=(strlen(line));i++){
                    if(line[i]==' '|| line[i]=='\0'){
                            newString[ctr][j]='\0';
                            ctr++;  //for next word
                            j=0;    //for next word, init index to 0
                    }
                    else{
                            newString[ctr][j]=line[i] - '0';
                            j++;
                    }

            }


    }
    for( i = 0; i < 10 ; i++){
            for( j = 0; j < 10; j++){
                    printf("%d ", newString[i][j]);
            }
            printf("\n");
    }
    fclose(fp);

文件如下

    3 
    9 3 34 4 12 5 2 
    6 3 2 7 1 
    256 3 5 7 8 9 1    

但是，我的输出如下

    3 -38 0 0 0 0 0 0 0 0 
    9 0 0 0 0 0 0 0 0 0 
    3 0 0 0 0 0 0 0 0 0 
    3 4 0 0 0 0 0 0 0 0 
    4 0 0 0 0 0 0 0 0 0 
    1 2 0 0 0 0 0 0 0 0 
    5 0 0 0 0 0 0 0 0 0 
    2 -38 0 0 0 0 0 0 0 0 
    6 0 0 0 0 0 0 0 0 0 
    3 0 0 0 0 0 0 0 0 0 

Answer 1

您遇到的问题是，假设代码会将您的数字读为整数，但实际上是将其读为字符。当您将字符分配给整数时，它会通过ascii table隐式转换。您必须使用此字符变量将其转换为整数，并找出一种在出现两位数数字的情况下将其添加到先前值的方法。下面显示了while循环的外观概述，但我将让您弄清楚其余部分。

while (fgets(line, sizeof(line), fp) != NULL){
    j = 0;//reset column to zero when you change lines
    for(i=0;i<=(strlen(line));i++){
        //only need some manipulation when the character read in is between 0 and 9
        if(line[i]>='0' && line[i] <= '9'){
            //use the ascii table linked to figure out how to convert the character value stored in line[i] to the integer value
            //store that number in newString[ctr][i] NOTE: you need to figure out how to keep 
            //the values of the characters already stored in the array for example if 38 is the number 
            //your trying to read from the file the first character read will be 3 then you will read 
            //8 and need to figure out how to add that 8 to the 3 which is already stored to make 38

        }
        else{
            j++;//move to next column
        }

    ctr++;//move to next row


}

Answer 2

首先，为什么要以好主的名字命名数组'newString'？

[第二，您的问题是该代码应该以整数形式读取您的数字，但实际上是以字符形式读取它的。当您将字符分配给整数时，它将通过ascii表隐式调用它。我下面的人将知道如何解决此问题，因为我不知道如何解决。祝你好运