C初级阶段练习题目（一）

以下是最近整理了一下C语言初级阶段写过的题，最近又做了一遍，开始学C语言的童鞋可以看看哈

后续一些C语言的题我复习完了也会陆续发上来

//*****************1、在屏幕上输出“hello  world”******************

intmain()

{

                printf("hello world\n");

                system("pause");

                return0;

}

//******************2、计算1，2，3，4...100这100个整数的和***********

intmain()

{

                intbegin = 1;

                intsum = 0;

                for(begin = 1; begin < 101; begin++)

                {

                                sum = sum + begin;

                }

                printf("%d\n", sum);

                system("pause");

                return0;

}

//***********************3、打印9×9乘法口诀表**********************这个可以扩展哈，输入9就是打印9×9的，输入12就是打印12×12的口诀

intmain()

{

                introw, col;

                intn = 0;

                scanf("%d", &n);

                for(row = 1; row <= n; row++)

                {

                                for(col = 1; col <=row; col++)

                                {

                                                printf("%2d*%d=%2d", row, col, row*col);

                                }

                                printf("\n");

                }

                return0;

}

//***********************4、求两个整数的较大值**********************

intmain()

{

                inta, b,ret;

                scanf("%d%d", &a, &b);

                 ret=a > b ? a : b;

                 printf("最大值=%d", ret);

                return0;

}

//*********************5、求10个整数中的最大值***********************

intmain()

{

                inti;

                intmax = 0;

                intarr[10] = { 1, 4, 7, 2, 6, 89, 45, 23, 56, 18 };

                for(i = 0; i < 10; ++i)

                {

                                if(arr[i]>max)

                                {

                                                max = arr[i];

                                }

                }

                printf("最大值=%d", max);

                return0;

}

//**********************6、求1到100之间的素数*************************

//素数：只能被1和它本身整除

intmain()

{

                inti = 0;

                intj = 0;

                intcount = 0;

                for(i = 1; i <= 100; ++i)

                {

                                for(j = 2; j <= i - 1; ++j)

                                {

                                                if(i%j == 0)

                                                {

                                                                break;

                                                }

                                }

                                if(i == j)

                                {

                                                printf("%4d  ", i);

                                                count++;

                                                if(count % 4 == 0)

                                                {

                                                                printf("\n");

                                                }

                                }

                }

                system("pause");

                return0;

}

//************************7、8、求两个整数的最大公约数、最小公倍数********************

//最大公约数不会大于最小的数

//最小公倍数=两整数的乘积/最大公约数

//（1）辗转相除法：（两整数a,b）

//            a%b得余数c，若c=0,则b为最大公约数

//                        若c不为0，则a=b,b=c,再回去执行a%b        

intmain()

{

                inta, b, m, n,c;

                printf("请输入两个整数：");

                scanf("%d%d", &a, &b);

                m = a;

                n = b;

                while(b != 0)

                {

                                c = a%b;

                                a = b;

                                b = c;

                }

                printf("最大公约数=%d\n", a);

                printf("最小公倍数=%d\n", m*n /a);

                return0;

}

//（2）辗转相减法

intmain()

{

                intm, n, a, b, c;

                printf("请输入两个整数：");

                scanf("%d%d", &a, &b);

                m = a;

                n = b;

                while(a != b)

                {

                                if(a > b)

                                                a = a - b;

                                else

                                                b = b - a;

                }

                printf("最大公约数=%d\n", a);

                printf("最小公倍数=%d\n", m*n / a);

                return0;

}

//**********************9、交换两整数的值*********************

intmain()

{

                inta, b;

                inttemp = 0;

                scanf("%d%d", &a, &b);

                temp = a;

                a = b;

                b = temp;

                /*a = a + b;

                b = a - b;

                a = a - b;*/

                /*a = a*b;

                b = a / b;

                a = a / b;*/

                /*a = a^b;

                b = a^b;

                a = a^b;*/

                printf("a=%d\nb=%d", a, b);

                return0;

}

//*************10、写一个函数，函数的功能为交换两个整数的值*************

Swap(int*a,int*b)

{

                inttemp;

                                /*temp = *a;

                                *a = *b;

                                *b = temp;*/

                

                                /**a = *a + *b;

                                *b = *a - *b;

                                *a = *a - *b;*/

                

                                /**a = (*a)*(*b);

                                *b = (*a) /(*b);

                                *a = (*a) /(*b);*/

                

                                *a= *a^*b;

                                *b= *a^*b;

                                *a= *a^*b;

}

intmain()

{

                inta = 0;

                intb = 0;

                scanf("%d%d", &a, &b);

                Swap(&a, &b);

                printf("a=%d\nb=%d", a, b);

                return0;

}