please help trying to use the "if" Statement Solved

hi
i new , trying learn....please see simple sketch
it works great   trying next   if delayperiod = 100  i start again , have delayperiod = 10....i cant correct  keep getting errors    thank in advance   patrick



/*
 test sketch learn.
*/

// pin 13 has led connected on arduino boards.
// give name:
int led = 13;
int delayperiod = 10;


// setup routine runs once when press reset:
void setup() {                
 // initialize digital pin output.
 pinmode(led, output);    
}

// loop routine runs on , on again forever:
void loop() {
 digitalwrite(led, high);   // turn led on (high voltage level)
 delay (delayperiod);               // wait
 digitalwrite(led, low);    // turn led off making voltage low
 delay(delayperiod);               // wait
 delayperiod = delayperiod + 1;
}

try:

if (delayperiod == 100 )
{
delayperiod = 10;
}

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