cprogrammingtutorial–parti-資料下載頁
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【導(dǎo)讀】arithmetic:+,-,*,/,%,++,--,+=,etc.logical:||,&&,!=,>=,<=. bitwise:|,&,^,~short,int,long. float,double. unsignedshort,unsignedint,unsignedlong. Chasnoclasses. charch;printf(“Enteracharacter:“);return0;scanf(“%f”,&radius);area=PI*radius*radius;return0;
【正文】 nd of strTo – again, make sure strTo is large enough to hold additional chars ? int strcmp(char str1[], char str2[])。 – pares string 1 to string 2 – return values are as follows ? less than 0 if str1 is lexicographically less than str2 ? 0 if str1 is identical to str2 ? greater than 0 if str1 is lexicographically greater than str2 Structures ? C does not have classes ? However, C programmers can create their own data types – called structures ? Structures allow a programmer to place a group of related variables into one place Creating a Structure ? Use the keyword struct to create a structure ? Example of creating a structure struct foo { char student[30]。 int grades[7]。 float endingGrade。 }。 ? Variables can now be created of the type struct foo ? Example of creating a structure variable int main() { struct foo myStruct。 … ? Notice that the struct keyword is part of the new data type name Using Structures ? To access any of the member variables inside the structure: – use the structure variable name, a period, and the member variable name ? When passed to a function, a structure is passed by value – just like any other data type Example Using Structures int main() { struct foo myStruct。 strcpy(, “John Doe”)。 for(i=0。 i7。 i++) [i] = 0。 = 0。 } typedef ? It can be hassle to always type struct foo ? C provides a way for you to give “nicknames” – it is the keyword typedef ? Simply put typedef in front of the data type and then follow it with the “nickname” Examples of typedef ? Using typedef with a standard data type typdef unsigned long ulong_t ? Using typedef with a structure declaration typdef struct foo { char student[30]。 int grades[7]。 float endingGrade。 } Foo。 ? Now whenever an unsigned long is needed, just type ulong_t ? Whenever a struct foo is needed, just type Foo
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