IT 常见面试题总结2

001：输入一行字符，统计其中有多少个单词，单词之间用空格分隔开

#include<stdio.h>
#include<string.h>
int main() {
	char str[100];
	int num = 0;
	int word = 0;
	gets(str);
	for (int i = 0; str[i]!= '\0';i++) {
		if (str[i]==' ') {
			word = 0;
		}else if(word==0){
			word = 1;
			num++;
		}
	}
	printf("%d", num);
	//使得dos界面不闪屏	            
	int in;
	scanf("%d", &in);
	return 0;
}

002：函数指针的应用：输入两个整数，当用户输入1，输出两个数的最大值，当用户输入2，输出两个数的最小值

#include<stdio.h>
int main() {
	int max(int, int);
	int min(int, int);
	int(*p)(int, int);

	int a, b, c, n;
	printf("输入两个整数\n");
	scanf("%d", &a);
	scanf("%d", &b);

	printf("输入操作模式：1 求最大值 2 求最小值");
	scanf("%d", &n);
	if (n == 1) {
		p = max;
	}
	else if(n==2) {
		p = min;
	}
	else
	{
		return;
	}

	c = (*p)(a, b);
	printf("c=%d", c);
	//使得dos界面不闪屏
	int in;
	scanf("%d", &in);
	return 0;

}
int max(int x,int y) {
	return (x > y ? x : y);

}
int min(int x,int y) {
	return (x < y ? x : y);
}

003：建立动态数组，输入5个学生的成绩，另外用一个函数检查其中有无低于60分，输出不及格的成绩。

#include<stdio.h>
#include<stdlib.h>
int main() {
	void check(int * score);

	int *pl;
	int i;
	pl = (int *)malloc(5 * sizeof(int));
	for (i = 0; i < 5;i++) {
		scanf("%d", pl + i);
	}

	check(pl);

	//使得dos界面不闪屏
	int in;
	scanf("%d", &in);
	return 0;
}
void check(int *p) {
	printf("不及格的成绩:\n");
	for (int i = 0; i < 5; i++) {
		if (p[i] < 60) {
			printf("%d\n", p[i]);
		}
	}
}

004：使用结构体建立简单的静态链表并输出

//建立简单的静态链表
#include<stdio.h>
struct Student {
	int num;
	float score;
	struct Student *next;
};

int main() {
	struct Student a, b, c;
	struct Student *head;
	struct Student *p;
	a.num = 100001;
	a.score = 89.5;
	b.num = 100002;
	b.score = 90.5;
	c.num = 100003;
	c.score = 85;

	head = &a;
	a.next = &b;
	b.next = &c;
	c.next = NULL;

	p = head;
	do {
		printf("%1d%5.1f\n", p->num, p->score);
		p = p->next;
	} while (p != NULL);

	//使得dos界面不闪屏	            
	int in;
	scanf("%d",&in);
	return 0;

}

005：使用结构体建立动态链表并输出

//建立简单的动态链表
#include<stdio.h>
#include<stdlib.h>
#define Len sizeof(struct Student)

struct Student {
	long num;
	float score;
	struct Student *next;
};
int n;//定义节点个数全局变量

struct Student* creat() {
	n = 0;
	struct Student *head;
	struct Student *p1, *p2;
	
	p1 = p2 = (struct Studenr *)malloc(Len);//开辟一个新的单元
	scanf("%d%f", &p1->num, &p1->score);//输入第一个节点
	head = NULL;
	while (p1->num != 0) {
		n = n + 1;
		if (n == 1) {
			head = p1;
		}
		else
		{
			p2->next = p1;

		}

		p2 = p1;
		p1 = (struct Student*)malloc(Len);
		scanf("%d%f", &p1->num, &p1->score);
	}
	p2->next = NULL;
	return head;
}
int main() {
	struct Student *pt;
	pt = creat();
	printf("num:%d\nscore:%f\n", pt->num, pt->score);

	//使得dos界面不闪屏	            
	int in;
	scanf("%d", &in);
	return 0;
}

006：