sscanf sprintf sstream

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4
  5 static void sscanf_test(void);
  6
  7 static void sscanf_test(void)
  8 {
  9     int ret;
 10     char *string;
 11     int  digit;
 12     char buf1[255];
 13     char buf2[255];
 14     char buf3[255];
 15     char buf4[255];
 16
 17     /*1.最简单的用法*/
 18     string = "china beijing 123";
 19     ret = sscanf(string, "%s %s %d", buf1, buf2, &digit);
 20     printf("1.string=%s\n", string);
 21     printf("1.ret=%d, buf1=%s, buf2=%s, digit=%d\n\n", ret, buf1, buf2, digit);
 22     /*
 23     **执行结果:
 24     **1.ret=3, buf1=china, buf2=beijing, digit=123
 25     **可以看出,sscanf的返回值是读取的参数个数
 26     */
 27
 28     /*2.取指定长度的字符串*/
 29     string = "123456789";
 30     sscanf(string, "%5s", buf1);
 31     printf("2.string=%s\n", string);
 32     printf("2.buf1=%s\n\n", buf1);
 33     /*
 34     **执行结果:
 35     **2.buf1=12345
 36     */
 37
 38     /*3.取到指定字符为止的字符串*/
 39     string = "123/456";
 40     sscanf(string, "%[^/]", buf1);
 41     printf("3.string=%s\n", string);
 42     printf("3.buf1=%s\n\n", buf1);
 43     /*
 44     **执行结果:
 45     **3.buf1=123
 46     */
 47
 48     /*4.取到指定字符集为止的字符串*/
 49     string = "123abcABC";
 50     sscanf(string, "%[^A-Z]", buf1);
 51     printf("4.string=%s\n", string);
 52     printf("4.buf1=%s\n\n", buf1);
 53     /*
 54     **执行结果:
 55     **4.buf1=123abc
 56     */
 57
 58     /*5.取仅包含指定字符集的字符串*/
 59     string = "0123abcABC";
 60     sscanf(string, "%[0-9]%[a-z]%[A-Z]", buf1, buf2, buf3);
 61     printf("5.string=%s\n", string);
 62     printf("5.buf1=%s, buf2=%s, buf3=%s\n\n", buf1, buf2, buf3);
 63     /*
 64     **执行结果:
 65     **5.buf1=123, buf2=abc, buf3=ABC
 66     */
 67
 68     /*6.获取指定字符中间的字符串*/
 69     string = "ios<android>wp7";
 70     sscanf(string, "%*[^<]<%[^>]", buf1);
 71     printf("6.string=%s\n", string);
 72     printf("6.buf1=%s\n\n", buf1);
 73     /*
 74     **执行结果:
 75     **6.buf1=android
 76     */
 77
 78     /*7.指定要跳过的字符串*/
 79     string = "iosVSandroid";
 80     sscanf(string, "%[a-z]VS%[a-z]", buf1, buf2);
 81     printf("7.string=%s\n", string);
 82     printf("7.buf1=%s, buf2=%s\n\n", buf1, buf2);
 83     /*
 84     **执行结果:
 85     **7.buf1=ios, buf2=android
 86     */
 87
 88     /*8.分割以某字符隔开的字符串*/
 89     string = "android-iphone-wp7";
 90     /*
 91     **字符串取道‘-‘为止,后面还需要跟着分隔符‘-‘,
 92     **起到过滤作用,有点类似于第7点
 93     */
 94     sscanf(string, "%[^-]-%[^-]-%[^-]", buf1, buf2, buf3);
 95     printf("8.string=%s\n", string);
 96     printf("8.buf1=%s, buf2=%s, buf3=%s\n\n", buf1, buf2, buf3);
 97     /*
 98     **执行结果:
 99     **8.buf1=android, buf2=iphone, buf3=wp7
100     */
101
102     /*9.提取邮箱地址*/
103     string = "Email:[email protected]";
104     sscanf(string, "%[^:]:%[^@]@%[^.].%s", buf1, buf2, buf3, buf4);
105     printf("9.string=%s\n", string);
106     printf("9.buf1=%s, buf2=%s, buf3=%s, buf4=%s\n\n", buf1, buf2, buf3, buf4);
107     /*
108     **执行结果:
109     **9.buf1=Email, buf2=beijing, buf3=sina, buf4=com.cn
110     */
111
112     /*10.过滤掉不想截取或不需要的字符串--补充,
113     **在%号后面加一*号,代表过滤这个字符串,不读取
114     */
115     string = "android iphone wp7";
116     sscanf(string, "%s %*s %s", buf1, buf2);
117     printf("10.string=%s\n", string);
118     printf("10.buf1=%s, buf2=%s\n\n", buf1, buf2);
119     /*
120     **执行结果:
121     **10.android wp7
122     */
123 }
124
125 int main(int argc, char **argv)
126 {
127     sscanf_test();
128
129     return 0;
130 }  

sprintf功能也很强   是把数据写进字符串里面   不多赘述

sstream是C++才有的

用流处理  也非常强大

不过鉴于不准备以后继续学习C++了

实在太浪费时间还难找工作

下段时间主要就注重算法

开始学习java 和 python