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It's because when C/C++ attempts to read a number and gets a non-number, the input functions stop reading at that point.
The offending character stays in the buffer.
Next read the character is...

He didn't?



Yes he did. I just expanded on how...

As laserlight suggested, use a string to input the values. They won't goof up if you enter the wrong thing.
Then you have to check each character in the string to make sure it's a valid number....