/**//*
* Name: IP Address * Funcion: To convert binary numbers to decimal numbers * Input: 00000011100000001111111111111111 * Output: 3.128.255.255
*/
#include <stdio.h>void main()
{ char input[32]; int output[4]; int count = -1; int i; for(i = 0; i < 4; i++ ) output[i] = 0; gets( input ); for( i = 0; i < 32; i++ )
{ if( i % 8 == 0 ) count++; if( input[i] == '1' ) { switch( i % 8 ) { case 0: output[count] += 128; break; case 1: output[count] += 64; break; case 2: output[count] += 32; break; case 3: output[count] += 16; break; case 4: output[count] += 8; break; case 5: output[count] += 4; break; case 6: output[count] += 2; break; case 7: output[count] += 1; break; default: break;
} } } printf( "%d.%d.%d.%d\n", output[0], output[1], output[2], output[3] );}
]]>
鏂規硶涓錛氫嬌鐢╛itoa鍑芥暟
1#include "stdio.h"
2#include "stdlib.h"
3
4void int2str(int , char *);
5
6int main()
7 {
8int i = 123;
9char s[64];
10int2str(i, s);
11puts(s);
12}
13
14void int2str(int i, char *s)
15 {
16_itoa(i, s, 10);
17}
#include "stdio.h"2
#include "stdlib.h"3
4
void int2str(int , char *);5
6
int main() 7 {
8
int i = 123;9
char s[64];10
int2str(i, s);11
puts(s);12
}13
14
void int2str(int i, char *s)15 {
16
_itoa(i, s, 10);17
}]]>
1#include <stdio.h>
2
3int main(void)
4{
5 unsigned char array[4] = {"0x0","0x0","0x02","0xe7"};
6 unsigned long num;
7 num = 0;
8 for(int i=0; i<sizeof(array); i++)
9 {
10 num<<=8;
11 num |= array[i];
12 }
13 printf("num = %d",num);
14 return 0;
15
16}
#include <stdio.h>2
3
int main(void)4
{5
unsigned char array[4] = {"0x0","0x0","0x02","0xe7"};6
unsigned long num;7
num = 0;8
for(int i=0; i<sizeof(array); i++)9
{10
num<<=8;11
num |= array[i];12
}13
printf("num = %d",num);14
return 0;15
16
}]]>
int strlen2(char *str)
{
for(i=0; str[i]!='\0'; i++) //浣跨敤寰幆鏉ヨ綆楅暱搴?br> return i;
}
//鍦ㄥ瓧絎︿覆涓鎵懼瓙瀛楃
int strindex(char *str,char *substr)
{
int end,i,j;
end = strlen2(str)-strlen2(substr);
if (end>0)
{
for(i=0;i<=end;i++)
/*浣跨敤寰幆姣旇緝*/
for(j=i; str[j]==substr[j-i];j++)
if (substr[j-i+1]=='\0')
return i+1;
}
return -1;
}
//涓葷▼寮忥細鍦ㄥ瓧絎︿覆涓鎵懼瓙瀛楃涓插嚭鐜扮殑浣嶇疆
void main()
{
char string[100];
char substring[100];
int result;
printf("璇瘋緭鍏ュ瓧絎︿覆");
gets(string);
printf("璇瘋緭鍏ヨ鎼滅儲鐨勫瓙瀛楃涓?);
gets(substring);
result = strindex(string,substring);
if (result > 0)
printf("瀛愬瓧絎︿覆浣嶇疆鍦?d",result);
else
printf("娌℃湁鎵懼埌");
getchar();
}
]]>