C---测试程序1

1 测试功能

??将保存在data.txt中文本数据读取出来，然后均除以0XFE，输出数据为精确到小数点后四位的浮点数，并保存到另一文本文件output.txt中。

输入

?

输出

?

2 测试代码

/*
    Func:   将保存在data.txt中文本数据读取出来，
            然后均除以0XFE，数据为精确到小数点后四位的浮点数。
            ，保存到另一文本文件output.txt
Note:   在windows下实现换行需要\r\n,而在UNIX,Linux下只要\n即可;
Author: yicm
Date:   2015-7-18
*/

#include <stdio.h>
#include <string.h>

int Hex_String2_Int(char s[])
{
    int i,m,temp=0,n;
    m = strlen(s);
    for(i=2;i<m;i++)
    {
        if(s[i]>=‘A‘&&s[i]<=‘F‘)
            n=s[i]-‘A‘+10;
        else if(s[i]>=‘a‘&&s[i]<=‘f‘)
            n=s[i]-‘a‘+10;
        else n=s[i]-‘0‘;
            temp=temp*16+n;
    }
    return temp;
}


int main()
{
    FILE *fp;
    FILE *fp_read;
    int temp;
    int count;
    char dataBuffer[8]  = "";

    count = 0;  
    fp = fopen("output.txt","w");
    if(NULL == fp){
        printf("open file failed!\n");
        return -1;
    }
    fp_read = fopen("data.txt","r");
    if(NULL == fp_read){
        printf("open file failed!\n");
        return -1;
    }

    int ct = 0;
    char buf[5] = "";
    float data ; 
    char ch;

    ch = fgetc(fp_read);
    while(ch != EOF){
        if(ch != ‘,‘){
            buf[ct++] = ch;
            if(ct == 4){
                ct = 0;
                data = Hex_String2_Int(buf);
                data = data/254;
                fprintf(fp,"%.4f\t",data);
                printf("%s\t%.4f\t",buf,data);
            }
        }
        else ;
        ch = fgetc(fp_read);
        if((ch == ‘\r‘) || (ch == ‘\n‘))ch = fgetc(fp_read);
    }

    fclose(fp);
    fclose(fp_read);

    return 0;
}