C语言例题讲解（上）

#include <stdio.h>
#include <string.h>
int main()
{
    printf("%d\n", strlen("c:\test\121"));
    return 0;
}

#include <stdio.h>
#include <string.h>
int main()
{
    char arr[] = {'b', 'i', 't'};
    printf("%d\n", strlen(arr));
  return 0;
}

#include <stdio.h>
int main()
{
    int n = 0;
    scanf("%d", &n);
    if(n%5==0)
        printf("YES\n");
    else
        printf("NO\n");
    return 0;
}

#include <stdio.h>
int main()
{
    int sec = 0;
    scanf("%d", &sec);
    int h = sec/60/60;
    int m = sec/60%60;
    int s = sec%60;
    printf("%d %d %d\n", h,m,s);
    return 0;
}

#include <stdio.h>
int main()
{
    int a = 0;
    int b = 0;
    scanf("%d %d", &a, &b);
    int m = a/b;
    int n = a%b;
    printf("%d %d\n", m, n);
    return 0;
}

#include <stdio.h>
int main()
{
    int a = 40;
    int c = 212;
    int ret = (-8+22)*a-10+c/2;
    printf("%d\n", ret);
    return 0;
}

/*
解题思路：本题目主要是考察函数的声明定义，题目比较简单，请参考以下实现。
*/
int get_max(int x, int y)
{
    if(x > y)
        return x;
    else 
        return y;
}
int main()
{
    int num1 = 10;
    int num2 = 20;
    scanf("%d%d", &num1, &num2);
    //要求：完成get_max函数
    int max = get_max(num1, num2);
    printf("max = %d\n", max);
  return 0;
}

#include <stdio.h>
int main()
{
    int n = 0;
    scanf("%d", &n);
    printf("%d\n", n/12*4+2);
    return 0;
}

//代码1
#include <stdio.h>
int main()
{
    int ret = printf("Hello world!");
    printf("\n");
    printf("%d\n", ret);
    return 0;
}
//代码2
#include <stdio.h>
int main()
{
    printf("\n%d\n", printf("Hello world!"));
    return 0;
}

#include <stdio.h>
int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    while(~scanf("%d %d %d", &a, &b, &c))
    {
        if((a+b>c) && (a+c>b) && (b+c>a))
        {
            //三角形
            if(a==b && b==c)//等边三角形
            {
                printf("Equilateral triangle!\n");
            }
            else if(((a==b)&&(b!=c)) || ((a==c)&&(c!=b)) || ((b==c)&&(c!=a)))//等腰
            {
                printf("Isosceles triangle!\n");
            }
            else
            {
                printf("Ordinary triangle!\n");
            }
        }
        else
        {
            //不是三角形
            printf("Not a triangle!\n");
        }
    }
    return 0;
}

#include <stdio.h>
int main()
{
    int weight = 0;
    int height = 0;
    double bmi = 0.0;
    scanf("%d%d", &weight, &height);
    bmi = weight/((double)height*height/10000);
    printf("%.2lf\n", bmi);
    return 0;
}

#include <stdio.h>
int sum(int a)
{
    int c = 0;
    static int b = 3;
    c += 1;
    b += 2;
    return (a + b + c);
}
int main()
{
    int i;
    int a = 2;
    for (i = 0; i < 5; i++) 
    { 
        printf("%d,", sum(a)); 
    } 
}