update 2.10, happy lunar new year

11/11/11.29.c

@@ -4,7 +4,7 @@ int main (void)
 {
     char ch1[40], ch2[40], q, *qwe;
     int i = 5;
-
+/*
     printf ("please enter ch1, strcpy wil make ch2: \n");
     s_gets (ch1, 40);
     printf ("1. %s\n", ch1);

11/11/11.35.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <string.h>
+char * read_things (char *st, int n);
+int main (void)
+{
+    char sth[20];
+    printf ("please enter something: \n");
+    printf ("%s", read_things(sth, 20));
+
+    return 0;
+}
+char * read_things (char *st, int n)
+{
+    char * ret, * f, * q, * e;
+    ret = fgets (st, n, stdin);
+    if (ret)
+    {
+        if (strchr (ret, ' ') || strchr (ret, '\t') || strchr (ret, '\n'))
+        {
+            q = strchr (ret, '\n');
+            f = (strchr (ret, ' ')) ? strchr (ret, ' ') : q;
+            e = (strchr (ret, '\t')) ? strchr (ret, '\t') : q;
+            *f = '\0';
+            *q = '\0';
+            *e = '\0';
+        }else
+        {
+            while ((getchar() == '\n') == 0);
+        }
+    }else
+    {
+        ret = "No result. \n";
+    }
+
+    return ret;
+
+}

11/11/11.36.c

@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <string.h>
+char * read_things (char *st, int n);
+int main (void)
+{
+    char sth[90];
+    unsigned int j;
+
+    printf ("how many charter would you like to deal? \n");
+    scanf ("%u", &j);
+    getchar();           //用来处理scanf后面的回车;
+    printf ("please enter something: \n");
+    printf ("%s", read_things(sth, 80));
+
+    return 0;
+}
+char * read_things (char *st, int n)
+{
+    char * red, c, *f, *e, *q;
+
+    red = fgets (st, n, stdin);
+    if (red)
+    {
+        c = *red;
+        if (c == '\n')
+        {
+            *red = '\0';
+            return red;
+        }
+        if (c == '\t' || c ==  ' ')
+        {
+            for (; (c == '\t') || (c == ' '); red ++)
+            {
+                c = *red;
+                if (c == '\n')
+                {
+                    *red = '\0';
+                    return red;
+                }
+            }
+            red --;
+        }
+        if (strchr (red, ' ') || strchr (red, '\t') || strchr (red, '\n'))
+        {
+            q = strchr (red, '\n');
+            f = (strchr (red, ' ')) ? strchr (red, ' ') : q;
+            e = (strchr (red, '\t')) ? strchr (red, '\t') : q;
+            *q = '\0';
+            *f = '\0';
+            *e = '\0';
+        }else
+        {
+            while (getchar() != '\n');
+        }
+    }else
+    {
+        red = "No result. \n";
+    }
+
+    return red;
+}

11/11/11.37.c

@@ -0,0 +1,58 @@
+#include "s_gets.h"
+const char * strchar (const char * st, char ch);
+int main (void)
+{
+    char str[80], ch;
+
+    printf ("please enter a sentence: \n");
+    s_gets (str, 80);
+    printf ("please enter a charter: \n");
+    ch = getchar ();
+    if (ch != '\n')
+    {
+        getchar();
+    }else;
+    while (*str != '\0')
+    {
+        if (strchar (str, ch))
+        {
+            printf ("%c is in %s! \n", ch, str);
+        }else
+        {
+            printf ("there is no %c in %s! \n", ch, str);
+        }
+        printf ("please enter another sentence: \n");
+        s_gets (str, 80);
+        printf ("please enter a charter: \n");
+        ch = getchar ();
+        if (ch != '\n')
+        {
+            getchar();
+        }else;
+    }
+    printf ("thank you!\n");
+
+    return 0;
+}
+const char * strchar (const char * st, char ch)
+{
+    const char * temp;
+    int p = 1;
+
+    for (int j = 0; j < strlen (st); j ++)
+    {
+        if (ch == st[j])
+        {
+            p = 0;
+            break;
+        }else;
+    }
+    if (p == 0)
+    {
+        temp = st;
+        return temp;
+    }else
+    {
+        return NULL;
+    }
+}

11/11/11.38.c

@@ -0,0 +1,55 @@
+#include "s_gets.h"
+int is_within (const char * st, char ch);
+int main (void)
+{
+    char ch, str[80];
+
+    printf ("please enter a sentence: \n");
+    s_gets (str, 80);
+    printf ("please enter a charter: \n");
+    ch = getchar ();
+    if (ch != '\n')
+    {
+        getchar();
+    }else;
+    while (*str)
+    {
+        if (is_within (str, ch))
+        {
+            printf ("%c appears in %s for %d times! \n", ch, str, is_within(str, ch));
+        }else
+        {
+            printf ("there is no %c in %s! \n", ch, str);
+        }
+        printf ("please enter another sentence: \n");
+        s_gets (str, 80);
+        printf ("please enter a charter: \n");
+        ch = getchar ();
+        if (ch != '\n')
+        {
+            getchar();
+        }else;
+    }
+    printf ("thank you!\n");
+
+    return 0;
+}
+int is_within (const char * st, char ch)
+{
+    int p = 0;
+
+    for (int j = 0; j < strlen (st); j ++)
+    {
+        if (ch == st[j])
+        {
+            p ++;
+        }else;
+    }
+    if (p != 0)
+    {
+        return p;
+    }else
+    {
+        return 0;
+    }
+}

11/11/11.39.c

@@ -0,0 +1,44 @@
+#include "s_gets.h"
+#define SHIT 80
+char * mystrncpy (char * st1, const char * st2, int n);
+int main (void)
+{
+    char str1[SHIT], str2[SHIT];
+    int q;
+
+    printf ("please keep enter two sentences, the second one will bite the tail of the first one. \n");
+    while (1)
+    {
+        printf ("now enter the first one: \n");
+        s_gets (str1, SHIT);
+        printf ("now enter the second one: \n");
+        s_gets (str2, SHIT);
+        if (!*str1 || !*str2)
+        {
+            break;
+        }else
+        {
+            printf ("how many charater would you like to paste: \n");
+            scanf ("%d", &q);
+            getchar();
+            printf ("%s\n", mystrncpy(str1, str2, q));
+            printf ("please enter next two sentences. \n");
+        }
+    }
+    printf ("thank you\n");
+
+    return 0;
+}
+char * mystrncpy (char * st1, const char * st2, int n)
+{
+    int j = strlen (st1);
+    int p = 0;
+
+    for (; j < SHIT && p < n && st2[p]; j ++, p ++)
+    {
+        st1[j] = st2[p];
+    }
+    st1 [j] = '\0';
+
+    return st1;
+}

11/11/11.40.c

@@ -0,0 +1,55 @@
+#include "s_gets.h"
+#define LONG 80
+char * string_in (char * st1, char * st2);
+int main (void)
+{
+    char str1[LONG], str2[LONG];
+
+    printf ("this program is checking if the second string is include by the first one. \n");
+    while (1)
+    {
+        printf ("now enter the first one: \n");
+        s_gets (str1, LONG);
+        printf ("now enter the second one: \n");
+        s_gets (str2, LONG);
+        if (!*str1 || !*str2)
+        {
+            break;
+        }else
+        {
+            char *result = string_in(str1, str2);
+            if (result)
+            {
+                printf("'%s' is in '%s' at position %ld.\n", str2, str1, result - str1 + 1);
+            }
+            else
+            {
+                printf("'%s' is not found in '%s'.\n", str2, str1);
+            }
+            printf("Please enter next two strings. \n");
+        }
+    }
+    printf ("thank you\n");
+
+    return 0;
+}
+char * string_in (char * st1, char * st2)
+{
+    int j, p, leng1 = strlen (st1), leng2 = strlen (st2);
+
+    for (j = 0; j < leng1 - leng2 + 1; j ++)
+    {
+        for (p = 0; p < strlen (st2); p ++)
+        {
+            if (st1[j + p] != st2[p])
+            {
+                break;
+            }else;
+        }
+        if (p == leng2)
+        {
+            return st1 + j;
+        }else;
+    }
+    return NULL;
+}

11/11/11.41.c

@@ -0,0 +1,38 @@
+#include "s_gets.h"
+#define LONG 80
+char * converce (char * str, char * rts);
+int main (void)
+{
+    char str1[LONG];
+
+    printf ("this program converses sentences. \n");
+    printf("now enter the sentence: \n");
+    while (1)
+    {
+        s_gets(str1, LONG);
+        if (!*str1)
+        {
+            break;
+        }else
+        {
+            char rts[strlen (str1) + 1];
+            printf ("%s\n", converce (str1, rts));
+        }
+        printf ("now enter another sentence: \n");
+    }
+    printf ("thank you\n");
+
+    return 0;
+}
+char * converce (char * str, char * rts)
+{
+    unsigned long int j = 0, p = strlen (str);
+
+    for (; j <= p; j ++)
+    {
+        rts[j] = str[p - j - 1];
+    }
+    rts[p] = '\0';
+
+    return rts;
+}