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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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