As can be seen from the formula, a C program must have one and only one main function, because the main function is the entry point and end point of the C program. Custom features and file inclusions may not be included.
Structure can be regarded as a special array. The structure name is equivalent to the array name. Structure variables are equivalent to array names, which is easy to understand.
An array contains a set of numbers of the same type. An array of integers, all of which are integers. A floating-point number group whose elements are all floating-point types. A structure contains a set of numbers, which usually belong to different types. Its members are integer, floating point and character. Whether there is a structure variable is the same as whether there is an array variable.
Extended data
The source code of the loop 1 to 100 formed by goto statement and if statement is as follows.
Master ()
{
int i，sum = 0；
I = 1；
Loop: if (I <; = 100)
{
sum = sum+I；
i++；
Go to loop;
}
printf("%d\n "，sum)；
}