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1 user commands2 system calls3 library functions4 special files5 file formats6 games7 conventions and miscellany8 administration and privileged commands这些只能有root执行 阅读全文
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";" 用于在一行中输入多个命令,执行顺序=输入顺序。For instance:$ ls -a;cd Music 阅读全文
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printf is not part of the C language; there is no input or output defined in C itself.printf is just a useful function from the standard library of functions that are normally accessible to C programs.The behaviour of printf is defined in the ANSI standard,(美国国家标准协会 American National Standards Insti 阅读全文
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with each % indicating where one of the other (second, third, ...) arguments is to be substituted, and in what form itis to be printed. For instance, %d specifies an integer argumentaugment each %dFor Instanceprintf("%3d'F%6d'C\n",Fahrenheit,Celsius);to print the first number of ea 阅读全文
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The reason for multiplying by 5 and dividing by 9 instead of just multiplying by 5/9 is that in C, as in many otherlanguages, integer division truncates: any fractional part is discarded. Since 5 and 9 are integers. 5/9 would betruncated to zero and so all the Celsius temperatures would be reported 阅读全文
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The type int means that the variables listed are integers; by contrast with float, which means floating point,i.e., numbers that may have a fractional part. The range of both int and float depends on the machine you areusing; 16-bits ints, which lie between -32768 and +32767, are common, as are 32-b 阅读全文
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#include int main(){ printf("Hello World !\c"); return 0;}[10:40:36@wjshan0808 ~/Documents/C Program]$ gcc printf.cprintf.c:4:9: warning: unknown escape sequence '\c'[10:41:52@wjshan0808 ~/Documents/C Program]$ g++ printf.cprintf.c: In function ‘int main()’:printf.c:4: warning: unk 阅读全文
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The first line of the C program#include tells the compiler to include information about the standard input/output library. 阅读全文