笔试之c语言

个人总结，欢迎指正~

二分法：

#include <stdio.h>int main(){int a[10]={1,2,3,4,5,6,7,8,9,10};int num,max,min;printf("Input a num which you wang to find out\n");scanf("%d",&num);max = sizeof(a);min = 0;while(num!=a[(max+min)/2]){if(num>a[(max+min)/2]){min= (max+min)/2;}else{max = (max+min)/2;}if(min>=max){printf("error\n");break;}}printf("it is :%d\n",(max+min)/2);return 0;}

冒泡法排序：

int main() {int a[10]={23,22,46,5,32,11,2,89,34,2};int num = sizeof(a)/sizeof(int);int i,j,temp;printf("%d\n",num);for(i=num-1;i>0;i--){for(j=0;j<i;j++){if(a[j]>a[j+1]){temp = a[j];a[j] = a[j+1];a[j+1] = temp;}} }for(i=0;i<10;i++)printf("%d,",a[i]);printf("\n");return 0;}

大小端验证：

#include <stdio.h>int main(){int a=0x1234;char *p=(char *)&a;printf("%x\n",*p);if(*p==0x12)printf("big\n");elseprintf("small\n");return 0;}