如何在C控制台程序中将字符串用户输入与int变量匹配

如何解决如何在C控制台程序中将字符串用户输入与int变量匹配

我想做一个简单的程序，比如商店系统。 长话短说，我希望我的用户输入代码（它是具有 int 价格值的 var 名称（示例输入：“a1 a2 b3 ...”））然后它可以计算其最终价格（fp = a1+a2+a3+.. .) 并添加一些“人工自动”进度或加载栏

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

int main() {
char sel;
int i,s;
int fp;
        
        //var name and price list
int mma1 = 2500;
int mma2 = 2000;
int mma3 = 3000;
int mma4 = 3500;

int mmb1 = 10000;
int mmb2 = 12000;
int mmb3 = 13000;
int mmb4 = 10000;

int mmc1 = 7000;
int mmc2 = 7500;
int mmc3 = 6500;
int mmc4 = 5000;

int mmd1 = 2000;
int mmd2 = 1500;
int mmd3 = 3000;
int mmd4 = 3500;

int mka1 = 3000;
int mka2 = 12000;
int mka3 = 10000;
int mka4 = 11000;

int mkb1 = 6000;
int mkb2 = 5000;
int mkb3 = 7000;
int mkb4 = 5500;

int mkc1 = 12000;
int mkc2 = 15000;
int mkc3 = 15000;
int mkc4 = 13000;

int mkd1 = 45000;
int mkd2 = 50000;
int mkd3 = 55000;
int mkd4 = 60000;
        
for(i=0; i<=7; i++)
    {
        
        
        //list
        char b=64,a[8][4][50]=
    {
        "proto1 = 2500","proto2 = 2000","proto3 = 3000","proto4 = 3500","proto5 = 10000","proto6 = 12000","proto7 = 13000","proto8 = 10000","proto9 = 7000","proto10 = 7500","proto11 = 6500","proto12 = 5000","proto13 = 2000","proto14 = 1500","proto15 = 3000","proto16 = 3500","proto17 = 3000","proto18 = 12000","proto19 = 10000","proto20 = 11000","proto21 = 6000","proto22 = 5000","proto23 = 7000","24 = 5500","proto25= 12000","26 = 15000","27 = 15000","28 = 13000","29 = 45000","30 = 50000","31 = 55000","32 = 60000"
    };
    
    
            for(i=0; i<=7; i++)
    {
        
        if(i==0)
        {
            printf("================================================================================================================================");
            printf("\nMenyediakan\n");
            printf("\n mm\n");
        }   
        else
        if(i==4)
        {
            printf("================================================================================================================================");
            printf("\nMenyediakan\n");
            printf("\n mk\n");
            b=64;
        }
        b++;
        printf("type %c  \n",b);
        
        for(s=0; s<=3; s++)
        {
            printf("      %d. %s \n",s+1,a[i][s]);
            
        }
        
        printf("\n");
    }
    printf("================================================================================================================================\n");
    
    
        
  
    printf("type all code of your desired item then press enter (example 'mma1 mma3 mkb3 mkb4 ... ')\n");
    scanf("%s",sel);
    // 
    
    fp = 
    
    //
    system("pause");
    return 0;
}
}

这个“fp =”部分是我想知道的 任何参考都将被接受， 任何建议将不胜感激 也接受任何选项，如使用调用函数等

非常感谢

解决方法

我通常是小步走的。您已经到了 int fp = <???>; 步骤......所以，请记住，拥有大量功能是好的：

fp = finalPrice(sel); // may need more arguments

并且，对于版本 0.0.0.0.1

int finalprice(const char *input) {
    return 42;
}

检查它是否有效，然后添加功能。
版本 0.0.0.0.2

int finalprice(const char *input) {
    if (*input == 'a') return 65;
    return -1;
}

不断改变函数，直到它对一堆测试输入“有效”。

,

这显然是一个矩阵操作练习。

您应该从表格（矩阵）中获取产品价格，而不是从单个变量中获取。创建一个包含价格的表格：

char product_prices_table[8][4][50]=
{
    /* mma */
    "2500","2000","3000","3500",/* mmb */
    "10000","12000","13000","10000",/* mmc */
    "7000"," 7500","6500","5000",/* mmd */
    "2000"," 1500",/* mka */
    "3000"," 12000","11000",/* mkb */
    "6000"," 5000","7000","5500",/* mkc */
    "12000","15000",/* mkd */
    "45000","50000","55000","60000"
};

此外，您应该将所有变量初始化为零，并确保您的变量 sel 包含足够的空间来存储用户输入。我将其声明更改为包含 1024 个字符（这是一个任意值）。

int fp = 0;
char sel[1024] = {0,};

scanf("%s",sel) 不限制读取的字符数且不包含空格，因此将其更改为 fgets(sel,1024,stdin);。

现在，创建一个函数以根据产品代码获取价格（来自 product_prices_table）。

static int get_product_price(char *product_code)
{
    int product_price = 0;

    /* Ensure input is valid */
    if (   (strlen(product_code) == 4)
        && (product_code[0] == 'm')
        && (product_code[1] == 'm' || product_code[1] == 'k')
        && (product_code[2] >= 'a' && product_code[2] <= 'd')
        && (product_code[3] >= '1' && product_code[3] <= '4'))
    {
        /* Get price from the table */
        int first_index = 0;

        if (product_code[1] == 'k')
            first_index = 4;

        if (product_code[2] == 'b')
            first_index += 1;
        else if (product_code[2] == 'c')
            first_index += 2;
        else if (product_code[2] == 'd')
            first_index += 3;

        int second_index = atoi(&product_code[3]) - 1;

        product_price = atoi(product_list[first_index][second_index]);
    }
    else
    {
        printf("error: invalid product code \"%s\"\n",product_code);
    }

    return product_price;
}

在您的 main 函数中，循环输入并使用每个产品代码调用您的函数，并在您的 fp 变量中累加。

/* Loop through all provided product codes */
int input_size = strlen(sel);
char *product_code = sel;

int i = 0;
for (; i < input_size; i++) {

    /* Check for end of product code */
    if (sel[i] == ' ' || (i == input_size - 1)) {

        /* Discard trailing whitespace or the last newline character */
        if (sel[i] == ' ' || sel[i] == '\n')
            sel[i] = 0;

        fp += get_product_price(product_code);

        /* Point to the next product code */
        if (i + 1 < input_size)
            product_code = &sel[i + 1]; 
    }   
}   

所以现在 fp 有所有提供的产品的总价。

完整代码如下：

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

#include <string.h>

char product_prices_table[8][4][50]=
{
    /* mma */
    "2500","60000"
};
    
static int get_product_price(char *product_code)
{
    int product_price = 0;

    /* Ensure input is valid */
    if (   (strlen(product_code) == 4)
        && (product_code[0] == 'm')
        && (product_code[1] == 'm' || product_code[1] == 'k')
        && (product_code[2] >= 'a' && product_code[2] <= 'd')
        && (product_code[3] >= '1' && product_code[3] <= '4'))
    {
        /* Get price from the table */
        int first_index = 0;

        if (product_code[1] == 'k')
            first_index = 4;

        if (product_code[2] == 'b')
            first_index += 1;
        else if (product_code[2] == 'c')
            first_index += 2;
        else if (product_code[2] == 'd')
            first_index += 3;

        int second_index = atoi(&product_code[3]) - 1;

        product_price = atoi(product_prices_table[first_index][second_index]);
    }
    else
    {
        printf("error: invalid product code \"%s\"\n",product_code);
    }

    return product_price;
}

int main() {
    char sel[1024] = {0,};
    int i,s;
    int fp = 0;
            
    for(i=0; i<=7; i++)
        {
            
        //list
             char b=64,a[8][4][50]=
         {
             "proto1 = 2500","proto2 = 2000","proto3 = 3000","proto4 = 3500","proto5 = 10000","proto6 = 12000","proto7 = 13000","proto8 = 10000","proto9 = 7000","proto10 = 7500","proto11 = 6500","proto12 = 5000","proto13 = 2000","proto14 = 1500","proto15 = 3000","proto16 = 3500","proto17 = 3000","proto18 = 12000","proto19 = 10000","proto20 = 11000","proto21 = 6000","proto22 = 5000","proto23 = 7000","24 = 5500","proto25= 12000","26 = 15000","27 = 15000","28 = 13000","29 = 45000","30 = 50000","31 = 55000","32 = 60000"
         };

        for(i=0; i<=7; i++)
        {
            
            if(i==0)
            {
                printf("================================================================================================================================");
                printf("\nMenyediakan\n");
                printf("\n mm\n");
            }   
            else
            if(i==4)
            {
                printf("================================================================================================================================");
                printf("\nMenyediakan\n");
                printf("\n mk\n");
                b=64;
            }
            b++;
            printf("type %c  \n",b);
            
            for(s=0; s<=3; s++)
            {
                printf("      %d. %s \n",s+1,a[i][s]);
                
            }
            
            printf("\n");
        }
        printf("================================================================================================================================\n");
      
        printf("type all code of your desired item then press enter (example 'mma1 mma3 mkb3 mkb4 ... ')\n");
        fgets(sel,stdin);

        /* Loop through all provided product codes */
        int input_size = strlen(sel);
        char *product_code = sel;

        int i = 0;
        for (; i < input_size; i++) {

            /* Check for end of product code */
            if (sel[i] == ' ' || (i == input_size - 1)) {

                /* Discard trailing whitespace or the last newline character */
                if (sel[i] == ' ' || sel[i] == '\n')
                    sel[i] = 0;

                fp += get_product_price(product_code);

                /* Point to the next product code */
                if (i + 1 < input_size)
                    product_code = &sel[i + 1];
            }
        }

        printf("fp = %d\n",fp);

        //
        system("pause");
        return 0;
    }
}