1. 打印摄氏度

/* 1.1 使用int类型进行计算 */#include 
    
     /* print Fahrenheit-Celsius table    for fahr = 0, 20, ...., 300 */main(){    int fahr, celsius;    int lower, upper, step;    lower = 0;      /* lower limit of temperature table */    upper = 300;    /* upper limit */    step = 20;      /* step size */    fahr = lower;    while(fahr <= upper) {        celsius = 5 * (fahr - 32) / 9;        printf("%d\t%d\n", fahr, celsius);        // printf(""%3d %6d\n", fahr, celsius);  /* right-justified */        fahr = fahr + step;    }}/*  1.2 使用 float 类型进行计算 */#include 
     
      main(){    float fahr, celsius;    int lower, upper, step;    lower = 0;    upper = 300;    step = 20;    fahr = lower;    while(fahr <= upper) {        celsius = (5.0 / 9.0) * (fahr - 32.0);        // fahr 3个字符宽度,无小数部分; celsius 6个字符宽度,额外包括一个小数位        printf("%3.0f %6.1f\n", fahr, celsius);         fahr = fahr + step;    }}/* 1.3 使用for循环语句 */#include 
      
       main(){    int fahr;    for(fahr = 0; fahr <= 300; fahr = fahr + 20) {        printf("%3d %6.1f\n", fahr, (5.0 / 9.0)*(fahr - 32));    }}/* 1.4 符号常量的应用         因为单纯的数字(如300,20),表达的意义非常模糊,不易于阅读 */#include 
       
        // 定义符号常量#define    LOWER    0#define    UPPER    300#define    STEP     20main(){    int fahr;    for(fahr = LOWER; fahr <= UPPER; fahr = fahr + STEP) {        printf("%3d %6.1f\n", fahr, (5.0 / 9.0) * (fahr - 32));    }}
       
      
     
    

1. 数据类型:
   • 基本数据类型:
     • int
     • short
     • long
     • float
     • double
     • char
     • arrays
     • structures
     • unions
     • pointers
   • printf()说明:
     • %d: 十进制整数(decimal)
     • %f: floating point
     • %o: octal(八进制)
     • %x: hexadecimal(十六进制)
     • %c: character
     • %s: string
     • %%: %
2. 字符串的处理

/* file copying (version 1) */#include 
    
     main(){   int c;   while((c = getchar()) != EOF)       putchar(c);}/* character counting */#include 
     
      main(){   long nc;   for(nc = 0; getchar() != EOF; ++nc)       ;   printf("%.0f\n", nc);}/* line counting */#include 
      
       main(){   int c, nl;   nl = 0;   while((c = getchar()) != EOF)       if (c == '\n')           ++nl;   printf("%d\n", nl);}/* 1-9:   Write a program to copy its input to its output, replacing each string of one or more   blanks by a single blank  */   /* version 1*/   #include 
       
           #define NONBLANK '-'   int main(void)   {       int c, lastc;       lastc = NONBLANK;       while((c = getchar()) != EOF) {           if(c == ' ') {               if(lastc != ' ') {                   putchar(c);               }           } else {               putchar(c);           }           lastc = c;       }        return 0;   }/* a bare-bones version of the UNIX program wc */#include 
        
         #define IN 1#define OUT 0main(){    int c, nl, nw, nc, state;    state = OUT;    nl = nw = nc = 0;    while((c = getchar()) != EOF) {        ++nc;        if (c == '\n') {            ++nl;        }        if (c == ' ' || c == '\n' || c == '\t') {            state = OUT;        } else if (state == OUT) {            state = IN;            ++nw;        }    }    printf("%d %d %d\n", nl, nw, nc);}
        
       
      
     
    

参考资料:

-