Question

我有两个文件，如下所示：

文件A是：

J5
J15
J25
J30
J35

和文件B是：

问题是我必须检查FILE A和FILE B的内容，并将Jth项的值复制到一个新文件中：（FILE C）：

如果你制定一个C代码来解决这个问题，那将会很有帮助。谢谢。

Answer 1

我建议你制作三个“随机存取文件”（因为它们更有条理），但首先是：

你需要用结构格式化每个文件它会在第一个文件中使用结构[1]你只需要一个成员名称（char数组），在第二个结构[2]中你需要三个成员的名字（字符数组）和2个值（我想两个整数），第三个限制与第二个相同，所以你可以重新利用它。

[1]

/* Struct for the first file. */
typedef {
    char name[4];
} file1_t;

[2]

/* Struct for the second file. */
typedef {
    char name[4];
    int value1, value2;
} file2_t;

要创建这些文件，您必须使用这样的代码（假设文件以“wb”模式打开，但未创建）：

/* This is an incomplete example (I can't make your whole Homework)*/

void file2Creator( FILE *fPtr )
{
    int i; // Counter to create the file.
    file2_t data = { "", 0, 0 }; // A blank example to format the file.

    /* You will create 9 consecutive records*/
    for( i = 1; i <= 9; i++ ){
        fwrite( &data, sizeof( file2_t ), 1, fPtr );
    }

    fclose( fPtr ); // You can close the file here or later however you need.  
}

之后你必须填写你所做的空格（我想文件是打开的）：

void fillFile2( FILE *fPtr)
{
    int position;
    file2_t data = { "", 0, 0 };


    printf( "Enter the position to fill (1-9) 0 to finish:\n?" );
    scanf( "%d", &position );

    while( position != 0 ){
        printf( "Enter the name, and the two other values (integers):\n?" );
        fscanf( stdin, "%s%d%d", data.name, data.value1, data.value2 );

        /* You have to seek the pointer. */
        fseek( fPtr, ( position - 1 ) * sizeof( file2_t ), SEEK_SET );
        fwrite( &data, sizeof( file2_t ), 1, fPtr );
        printf( "Enter a new position (1-9) 0 to finish:\n?" );
        scanf( "%d", &position );
    }

    fclose( fPtr ); //You can close the file or not, depends in what you need.
}

现在我想你已经格式化了file1，文件2和文件3，文件1和2已经填满了，你想要填写文件3怎么做？简单。

/* 3 pointers to each file */
void fillFile3( FILE *f1Ptr, FILE *f2Ptr, FILE *f3Ptr )
{
    int i, j, k, number;
    char word[ 4 ];
    file1_t data1 = { "" };
    file2_t data2, data3 = { "", 0, 0 };

    k = 1;

    /* I suppose that files are opened with their correctly FILE pointers. */
    for( i = 1; i <= 5; i++ ){

        /* I locate in the "i" position of the file1. */
        fseek( f1Ptr, ( i - 1 ) * sizeof( file1_t ), SEEK_SET );

        /* I read the slot. */
        fread( &data1, sizeof( file1_t ), 1, f1Ptr );

        /*Now we compare the file2 until we find the correct value, if it is organized we can jump some slots if not compare with all.*/
        for( j = 1; j <= 9, j++ ){
            fseek( f2Ptr, ( j - 1 ) * sizeof( file2_t ), SEEK_SET );
            fread( &data2, sizeof( file2_t ), 1, f2Ptr );

            /* We compare the strings, If they are equal we paste the value in file 3*/
            if( strcmp( data1.name, data2.name ) == 0 ){

               /*file 3 is of type of the file 2*/
               fseek( f3Ptr, ( k - 1 ) * sizeof( file2_t ), SEEK_SET );
               fwrite( &data2, sizeof( file2_t ), 1, f3Ptr );
               k++;
               break;
            }
        }
    }
    fclose( f1Ptr );
    fclose( f2Ptr );
    fclose( f3Ptr );
}

Answer 2

我想做这个程序，但它不会运行。

#include <stdio.h>
#include <stdlib.h>

int main()
{
    FILE *fp1 ,*fp2;
    char ca , cb;
    int i,j,x,s;
    char A[i][j],B[i][j];
    char file1[1024], file2[1024];

    printf( "Enter file1: ", file1 );
    gets( file1 );
    printf( "Enter file2: ",file2 );
    gets( file2 );
    fp1=fopen( file1, "r");

    if ( fp1 == NULL ){
        printf("Cannot open %s for reading \n", file1 );
        exit(1);
    }

    while ( ( fgets( file1, sizeof file1, stdin ) ) != EOF ){
        for(i=0;i<2500;i++){
            for(j=0;j<5;j++){
                fscanf(fp1,"%s",&A[i][j]);
            }
        }
    }

    fp2 = fopen( file2, "r");

    if ( fp2 == NULL ){
        printf("Cannot open %s for reading \n", file2 );
        exit( 1 );
    }

    while ( fgets ( file2, sizeof file2, stdin) != EOF){
        for( i = 0; i < 2500; i++ ){
            for( j = 0; j < 5; j++ ){
                fscanf(fp2,"%s",&B[i][j]);
            }
        }
    }
    /*Here it was a ; without any sense (after the if)*/
    if( strcmp( A[i][j], B[i][j] ) ) == 0;
    {
        printf( "%s /n %s  ", strcmp( A[i][j], B[i][j] ) );
    }

    fclose(fp1);
    fclose(fp2);

    return 0;
}

编译器显示语法错误befor“==”令牌（strcmp函数底部的第8行）。任何帮助？

Answer 3

你在if之后添加了一个分号，并忘记了一个括号。

if( strcmp( A[i][j], B[i][j] ) == 0 ){
        printf( "%s /n %s  ", strcmp( A[i][j], B[i][j] ) );
}

比较和检查两个文件中的列

3 个答案: