What is the use of if in C language programming
C language programming in what is the use of if, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.
Sequence, selection and loop are the three basic structures of a program, and no matter how complex the program is, it is written with these three structures.
Usage of if (example 1)
# include
Int main (void)
{
If (true)
If (false)
Printf ("!\ n")
Else
Printf ("hehe!\ n"); / / pay attention to the correspondence between else and if, and the correspondence between else and if is from the middle to the opposite end.
If (true)
{
If (false)
Printf ("!\ n")
}
Else
Printf ("hehe!\ n"); / / for else to correspond to the first if, you must enlarge parentheses on the if statement that should correspond to it to make it a separate sentence.
Return 0
}
Program output:
Example 2
# include
Int main (void)
{
If (3) / / if (): deal with true or false, 0 is false, non-0 is true
{
Printf ("AAAA\ n")
Printf ("BBBB\ n")
}
Return 0
}
Program output:
Example 3
# include
Int main (void)
{
/ / int i, j
/ / printf ("Please enter the value of I j:")
/ / scanf ("d d", & I, & j)
If (2 times 3)
Printf ("I is greater than j\ n")
Else
Printf ("I is less than j\ n")
Return 0
}
Program output:
Example 4:
# include
Int main (void)
{
Int x
Int y
Printf ("Please enter a value for x:")
Scanf (& d, & x)
Y = 0
If (x > = 0)
If (x > 0)
Y = 1
Printf ("y =% d\ n", y)
Return 0
}
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