Compiler Error 18

Expected a ")"

main.cpp

#include "mbed.h"

Serial pc(USBTX,USBRX);
int i;

int main() {
    pc.printf("Echoes anything you type\n\r");
    for (i=0;i<100;i++) {
        while(1){
            pc.printf("\rCounter %d units. ", i++;    // <-- Closing bracket is missing.
        }
    }
}
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