c语言经典算法例程

c语言经典算法例程

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//==================================================================================


//==================================================================================
void test1()
{
    char str1[] = "abcdefg";
    char str2[] = "abc";
    if (strlen(str2) < strlen(str1))
    {
        printf("str2 is longer than str1 
");
    }
}
void test2()
{
    struct record
    {
        char name[10];
        int age;
    };
    struct record array[2] = { {"ken",24},{"knuth",28}};

    FILE *fp = fopen("d:/work/code_c/Project0622/file0622/test2.txt", "w");
    if (fp == NULL)
    {
        perror("open file recfile");
        exit(1);
    }
    fwrite(array, sizeof(struct record), 2, fp);
    fclose(fp);
    printf("test2 finish
");
}
//-----------------------------------------------------
void Algorithm_Test1()
{
    printf("hello world!");
}
void Algorithm_Test2()
{
    printf("2输出整数");
    int number;

    printf("请输入一个整数：");
    scanf("%d",&number);
    printf("you input number:%d 
",number);
}
void Algorithm_Test3()
{
    printf("3.输出单字符
");
    char c;
    c = 'A';
    printf("c of value %c 
",c);
}
void Algorithm_Test4()
{
    printf("4.输出浮点数
");
    float f;
    f = 3.141512f;
    printf("f of value %f 
", f);
}
void Algorithm_Test5()
{
    printf("5.输出双精度 
");
    float d;
    d = 3.141512f;
    printf("d of value %le 
", d);
}
void Algorithm_Test6()
{
    printf("6.二个整数相加 
");
    int FirstNumber, SecondNumber, SumOfTwoNumber;

    scanf("%d %d", &FirstNumber, &SecondNumber);
    SumOfTwoNumber = FirstNumber + SecondNumber;
    printf("输出结果:%d + %d = %d 
", FirstNumber, SecondNumber, SumOfTwoNumber);
}
void Algorithm_Test7()
{
    printf("7.二个浮点相乘 
");
    double FirstNumber, SecondNumber, product;

    scanf("%lf %lf", &FirstNumber, &SecondNumber);
    product = FirstNumber * SecondNumber;
    printf("输出结果: %.2lf 
", product);
}
void Algorithm_Test8()
{
    printf("8.字符转ASCII 
");
    char c;
    printf("输入一个字符：");
    scanf("%c",&c);
    printf("%c 的ASIIC %d
", c,c);


    char s[65536];
    printf("请输入长度小于 %d 的任意字符：", 65536);
    scanf("%s", s);    // 读取字符串。
    for (int i = 0; s[i]; i++) 
    {
        printf("%c的ASCII:%d	
", s[i], s[i]);
    }

    char num, enter;
    int temp = 1;
    for (; temp > 0;)
    {
        printf("----------------------------
");
        printf("|**      开始            **|
");
        printf("|**ASCII  转  字符  按:1 **|
");
        printf("|**字符   转  ASCII 按:2 **|
");
        printf("|**      结束       按:0 **|
");
        printf("----------------------------
");
        scanf("%d", &temp);
        if (temp == 1)
        {
            printf("请输入数值小于 %d 的任意字符：", 127);
            scanf("%d", &num);
            printf("ASCII为 %d ,对应的字符为 %c 
", num, num);
        }
        if (temp == 2)
        {
            printf("输入一个字符: 
");
            scanf("%c", &enter);      //回车键也算字符,所以这里使用其他变量替之.
            scanf("%c", &num);
            printf("     %c 的 ASCII 为 %d    
", num, num);
        }
    }
}
void Algorithm_Test9()
{
    printf("9.二个数相除 
");
    int dividend, divisor, quotient, remainder;

    printf("输入除数：");
    scanf("%d", &dividend);

    printf("输入除数: ");
    scanf("%d", &divisor);

    // 计算商
    quotient = dividend / divisor;

    // 计算余数
    remainder = dividend % divisor;

    printf("商 = %d
", quotient);
    printf("余数 = %d
", remainder);
}
//==================================================================================
// main
//==================================================================================
int main()
{
    printf("测试开始 Alex 
");
    //-------------------------------------------------------
    //test1();
    //test2();
    //Algorithm_Test1();
    //Algorithm_Test2();
    //Algorithm_Test3();
    //Algorithm_Test4();
    //Algorithm_Test5();
    //Algorithm_Test6();
    //Algorithm_Test7();
    //Algorithm_Test8();
    Algorithm_Test9();
    //-------------------------------------------------------
    system("pause");
    return 0;
}

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