Description: Find a C source file control flow keyword (while, for, if) the occurrence. According to the order in which they appear in the output location (by number of lines and the line in the first few characters). Keywords requirements should not appear in a string constant calculation, while the C program to meet the following requirements: 1, the program is in line with the C language syntax requirements. 2, double quotes will only be used in a string literal, does not appear elsewhere in the double-quote character. " 3, all identifiers in the program only consist of letters and numbers. 4, the program did not comment statements.
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P5.c