清_数组练习

1、倒着打印

#include<stdio.h>
void main()
{
		short score[]={1,2,3,4,5};
		int i=0;
		for (i=4;i>=0;i-- )
		{
				printf("%d\n",score[i]);
		}
}

2、判断某个值是否存在

 #include<stdio.h>
    void main()
    {
    		short score[]={1,2,3,4,5};
    		int i=0,j=0;
    		scanf("%d",&j);
    		for ( i=0;i<5;i++ )
    		{
    				if (j == score[i] )
    				{
    						printf("yes");
    						break;
    				}
    				if (i == 4 )
    				{
    						printf("no");	
    				}
    		}

3、此数组元素的和

#include<stdio.h>
void main()
{
			short score[]={1,2,3,4,5};
			int i=0,sum=0;
			for(i=0;i<5;i++ )
			{
					sum += score[i];
			}
			printf("%d\n",sum);
}

4、输出最大值的下标和元素值

#include<stdio.h>
void main()
{
		short score[]={1,2.3,4,5};
		int i=0,j=0;
		int listen=score[0];
		for(i=1;i<5;i++)
		{
				if( listen < score[i] )
				{
						listen=score[i];
						j=i;
				}
		}
		printf("%d%d\n",listen,j);
}

5、char buf[6]={‘l’,‘v’,‘q’,‘i’,‘n’,‘g’}输出

   #include<stdio.h>
   void main()
   {
   			int  i=0;
   			for (i=0;i<6;i++)
   			{
   					printf("%c\n",buf[i]);
   			}
   }

6、求buf的字符数量。

  #include<stdio.h>
  void main()
  {
  		char name[]={1,2,3,4,5,6,7};
  		int i=0;
  		int j=0;
  		while(name[i] != 0)
  		{
  				i++
  		}
  		printf("%d\n",i);
  		printf("%d\n",sizeof(name));
  		printf("%d\n",strlen(name));
  }

7、char buf[]=“100a” int num;

#include<stdio.h>
void main()
{
		char buf[]="100a";
		int i=0,j=0,num=0;
		while( buf[i] != '\0' )
		{
				 if ( buf[i] >='0' && buf[i] <='9' )
				 {
				 		printf("%c",buf[i]);
				 }
				 i++;
		}
}

8、char buf[]=“fdsaKFDU*&^*9889f763JKJFDK”
统计：大写，小写，数字，其他字符数量

 #include<stdio.h>
 void main()
 {
 		int i=0,a=0,b=0,c=0,d=0,f=0,m=0;
 		while( buf[i] != '\0' )
 		{
 					if ( buf[i] >= 'A' && buf[i] <= 'Z')
 					{
 							a=a+1;
 					}
 					else if ( buf[i] >= 'a'  &&  buf[i] <= 'Z' )
 					{
 							m=buf[i] - 32;
 							printf("%c\t",m);
 							b=b+1;
 					}
 					else if ( buf[i] == 32 )
 					{
 							c=c+1;
 					}
 					else if ( buf[i] >='0' && buf[i] <='9' )
 					{
 							d=d+1;
 					}
 					else 
 							f=f+1;
 							i++;     						
 		}
 		printf("%d\n",a);
 		printf("%d\n",b);
 		printf("%d\n",c);
 		printf("%d\n",d);
 		printf("%d\n",f);
 		
 }

9、选择排序

#include<stdio.h>
void main()
{
		short score[]={9,4,6,3,7,2,5,1};
		int i=0,j=0;// i未排序   j用于取最值
		int listen=0;//监哨值法
		int temp=0;
		for ( i=0;i<7-1;i++ )
		{
				listen=i;
				for( j=i+1;j<7;j++ )
				{
						if( score[listen] < score[j] )
						listen=j;
				}
				//两数对换
				if( i != listen )
				{
						temp = score[i];
						score[i]=score[listen];
						score[listen]=temp;
				}
		}
		for( i=0;i<7;i++ )
		printf("%d\n",score[i]);
}