1 #include 
      
        2 #define UPPER 300 3 #define LOWER 0 4 #define STEP 20 5  6 main() 7 { 8     float farh, celsius; 9 10     farh = LOWER;11     celsius = LOWER;12     printf("---C to F---\n");13     while (celsius <= UPPER)14     {15         farh = (9.0*celsius) / 5.0 + 32.0;16         printf("%3.2f %6.2f\n", celsius, farh);17         celsius += STEP;18     }19     printf("------------\n");20     for (celsius = UPPER; celsius >= LOWER; celsius -= STEP)21     {22         printf("%3.2f %6.2f\n", celsius, (9.0*celsius) / 5.0 + 32.0);23     }24 25     farh = LOWER;26     celsius = LOWER;27     printf("---F to C---\n");28     while (farh <= UPPER)29     {30         celsius = 5.0 * (farh-32.0) / 9.0;31         printf("%3.2f %6.2f\n", farh, celsius);32         farh += STEP;33     }34     printf("------------\n");35     for (farh = UPPER; farh >= LOWER; farh -= STEP)36     {37         printf("%3.2f %6.2f\n", farh, 5.0 * (farh-32.0) / 9.0);38     }39 }
      

1 #include 
      
        2  3 main() 4 { 5     float c; 6  7     while (c = getchar() != EOF) 8     { 9         printf("getchar != EOF --- %3.1f\n", c);10         printf("EOF is %d\n", EOF);11     }12 }
      

1 #include 
      
        2  3 #define OUT 0 4 #define IN 1 5  6 main() 7 { 8     int state = OUT; 9     int c;10     int number = 0;11 12     while ((c = getchar()) != EOF)13     {14         if (((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')))15         {16             putchar(c);17 18             if (state == OUT)19             {20                 state = IN;21                 number++;22             }23         }24         else25         {26             putchar('\n');27             state = OUT;28         }29     }30     printf("The number of words is: %d\n", number);31 }
      

1 #include 
      
        2  3 #define MAXSIZE 10 4 #define Height 10    // 垂直直方图高度 5 #define IN 1 6 #define OUT 0 7  8 main() 9 {10     int wordLength[MAXSIZE], charNumber[128];11     int c, i, j;12     int state = OUT;13     int number;14 15     // 下面两个for是初始化16     for (i = 0; i < MAXSIZE; i++)17     {18         wordLength[i] = 0;19     }20     for (i = 0; i < 128; i++)21     {22         charNumber[i] = 0;23     }24 25     // 下面的while是对输入进行计数26     while ((c = getchar()) != EOF)27     {28         charNumber[c]++;    // 存储字符个数29 30         if (((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')))31         {32             if (state == OUT)33             {34                 state = IN;35                 number = 1;36             }37             else if (state == IN)38             {39                 number++;40             }41         }42         else43         {44             if (state == IN)45             {46                 state = OUT;47                 wordLength[number]++;48             }49 50         }51     }52 53     // 下面一个for是输出水平直方图54     for (i = 0; i < MAXSIZE; i++)55     {56         printf("Length of %d:\t", i);57         for (j = 0; j < wordLength[i]; j++)58         {59             printf("***");60         }61         printf("\n");62     }63     // 下面两个for是输出垂直直方图64     for (i = 0; i < Height; i++)65     {66         for (j = 0; j < MAXSIZE; j++)67         {68             if (wordLength[j] >= (MAXSIZE-i))69             {70                 printf("*\t");71             }72             else73             {74                 printf(" \t");75             }76         }77     }78     for (i = 0; i < MAXSIZE; i++)79     {80         printf("%d\t", i);81     }82 83     // 输出各字符个数84     for (i = 0; i < 128; i++)85     {86         printf("Number of ASCII---%d: %d\n", i, charNumber[i]);87     }88 }
      

1 #include 
      
        2 #define UPPER 300 3 #define LOWER 0 4 #define STEP 20 5  6 float CtoF(float celsius); 7 float FtoC(float farh); 8  9 main()10 {11     float farh, celsius;12 13     farh = LOWER;14     celsius = LOWER;15     printf("---C to F---\n");16     while (celsius <= UPPER)17     {18 19         printf("%3.2f %6.2f\n", celsius, CtoF(celsius));20         celsius += STEP;21     }22     printf("------------\n");23     for (celsius = UPPER; celsius >= LOWER; celsius -= STEP)24     {25         printf("%3.2f %6.2f\n", celsius, CtoF(celsius));26     }27 28     farh = LOWER;29     celsius = LOWER;30     printf("---F to C---\n");31     while (farh <= UPPER)32     {33         printf("%3.2f %6.2f\n", farh, FtoC(farh));34         farh += STEP;35     }36     printf("------------\n");37     for (farh = UPPER; farh >= LOWER; farh -= STEP)38     {39         printf("%3.2f %6.2f\n", farh, FtoC(farh));40     }41 }42 43 float CtoF(float celsius)44 {45     return ((9.0*celsius) / 5.0 + 32.0);46 }47 48 float FtoC(float farh)49 {50     return (5.0 * (farh-32.0) / 9.0);51 }
      

1 #include 
      
        2 #define MAXLINE 1000 3  4 int getline(char line[], int maxline); 5 void copy(char to[], char from[]); 6 void reverse(char line[], int len); 7  8 int main() 9 {10     int ml, len;11     char line[MAXLINE];12     char longest[MAXLINE];13 14     ml = 0;15     while ((len = getline(line, MAXLINE)) > 0)16     {17         reverse(line, len);18         if (len > 80)19         {20             printf("%s", line);        //1-1721         }22         if (len > ml)23         {24             ml = len;25             copy(longest, line);26         }27     }28     if (ml > 0)29     {30         printf("%s", longest);31     }32     return 0;33 }34 35 int getline(char line[], int maxline)36 {37     int c, i, k;38     int j = 0;39     int flag = 0;40 41     for (i = 0; (c = getchar()) != EOF && c != '\n'; ++i)42     {43         if (c == ' ' || c == '\t')44         {45             if (flag == 0)      // flag判断在空格或\t后是否还有其他字符46             {47                 flag = 1;48                 k = j;49             }50         }51         else52         {53             flag = 0;54         }55         if (i < maxline-2)56         {57             line[j++] = c;58         }59     }60     if (c == '\n')61     {62         if (flag == 1)63         {64             j = k;65             i = k;66         }67         line[j++] = c;68         ++i;69     }70     line[j] = '\0';71 72     return i;73 }74 75 void copy(char to[], char from[])76 {77     int i = 0;78 79     while ((to[i] = from[i]) != '\0')80     {81         ++i;82     }83 }84 85 void reverse(char line[], int len)86 {87     int i = 0;88     int j = len-1;89     int swap;90 91     for (i, j; i < j; i++, j--)92     {93         swap = line[i];94         line[i] = line[j];95         line[j] = swap;96     }97 }
      

1 #include 
      
        2  3 #define TABING 8 4  5 main() 6 { 7     int nb = 0; 8     int i, c; 9 10     while ((c = getchar()) != EOF)11     {12         if (c == ' ')13         {14             nb++;15             if (nb == TABING)16             {17                 nb = 0;18                 printf("\t");19             }20         }21         else if (c == '\t')22         {23             nb = 0;24             printf("\t");25         }26         else27         {28             for (i = 0; i < nb; i++)29             {30                 printf(" ");31             }32             nb = 0;33             printf("%c", c);34         }35     }36 }
      

1 #include 
      
        2 #include 
       
         3  4 void headFile(void); 5 void countDirectly(void); 6  7 main() 8 { 9     headFile();10     countDirectly();11 }12 13 void headFile(void)14 {15     // signed types16     printf("signed char min = %d\n", SCHAR_MIN);17     printf("signed char max = %d\n", SCHAR_MAX);18     printf("signed short min = %d\n", SHRT_MIN);19     printf("signed short max = %d\n", SHRT_MAX);20     printf("signed int min = %d\n", INT_MIN);21     printf("signed int max = %d\n", INT_MAX);22     printf("signed long min = %ld\n", LONG_MIN);23     printf("signed long max = %ld\n", LONG_MAX);24     // unsigned types25     printf("unsigned char max = %u\n", UCHAR_MAX);      // %u is output in unsigned int26     printf("unsigned short max = %u\n", USHRT_MAX);27     printf("unsigned int max = %u\n", UINT_MAX);28     printf("unsigned long max = %lu\n", ULONG_MAX);     // %lu is output in unsigned long29 }30 31 void countDirectly(void)32 {33     // signed types34     printf("signed char min = %d\n", -(char)((unsigned char) ~0 >> 1));35     printf("signed char max = %d\n", (char)((unsigned char) ~0 >> 1));36     printf("signed short min = %d\n", -(short)((unsigned short) ~0 >> 1));37     printf("signed short max = %d\n", (short)((unsigned short) ~0 >> 1));38     printf("signed int min = %d\n", -(int)((unsigned int) ~0 >> 1));39     printf("signed int max = %d\n", (int)((unsigned int) ~0 >> 1));40     printf("signed long min = %ld\n", -(long)((unsigned long) ~0 >> 1));41     printf("signed long max = %ld\n", (long)((unsigned long) ~0 >> 1));42     // unsigned types43     printf("unsigned char max = %u\n", (unsigned char) ~0);44     printf("unsigned short max = %u\n", (unsigned short) ~0);45     printf("unsigned int max = %u\n", (unsigned int) ~0);46     printf("unsigned long max = %lu\n", (unsigned long) ~0);47 }