The program doesn’t stop on scanf(“%c”, &ch) line, why? [duplicate]

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Let’s say you input 2 when you’re reading for num. The actual input stream will be 2\n (\n is the newline character). 2 goes into the num, and there remains \n, which goes into ch. To avoid this, add a whitespace in format specifier. 

scanf(" %c", &ch);

This will ignore any whitespaces, newlines or tabs.

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