摘要： function strlen <cstring> size_t strlen ( const char * str );Get string lengthReturns the length of str. The length of a C string is determined by the terminating null-character: A C string is as ... 阅读全文

摘要： function atoi <cstdlib> int atoi ( const char * str );Convert string to integerParses the C string str interpreting its content as an integral number, which is returned as an int value. The functi... 阅读全文

摘要： char * strncpy ( char * destination, const char * source, size_t num );Copy characters from stringCopies the first num characters of source to destination. If the end of the source C string (which is ... 阅读全文

摘要： function memset <cstring> void * memset ( void * ptr, int value, size_t num );Fill block of memorySets the first num bytes of the block of memory pointed by ptr to the specified value (interpreted... 阅读全文

摘要： Arguments to main For those writing programs which will run in a hosted environment, arguments to main provide a useful opportunity to give parameters to programs. Typically, this facility is used to... 阅读全文

摘要： argc and argv So far, all the programs we have written can be run with a single command. For example, if we compile an executable called myprog, we can run it from within the same directory with the ... 阅读全文