Why Can't Compiler Resolve Variables ?

Dear JetBrains Developer Community,

I'm struggling with a sample tutorial from my Ivor Horton textbook (Beginning C: Fifth Edition). The compiler can't resolve these variables.

Why is this happening ?



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If the FOR statement is for the block included by {} then after the FOR statement you do not need a semicolon there,
and also line 23 ,in the FOR statement,the format is as below:
for(  ;  ;  )
{
}
2 semicolons in it,never miss one.
In a word,the syntax is wrong,and google how to use it for detail..

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