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To compare an unsigned integer to one in an if-statement using C++, you would use the comparison operator "==" (equals). For example:

unsigned int a = 5; if(a == 5){ // code block }

Here, the if-statement checks if the value of the unsigned integer "a" is equal to 5. If it is, the code block will be executed. If it is not, the code block will be skipped.