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- Jack Klein. Bullet Proof Integer Input Using strtol(). http://home.att.net/~jackklein/c/code/strtol.html
- ISO/IEC 9899-1999 Section 7.20.1.4 The strtol, strtoll, strtoul, and strtoull functions; Section 7.20.1.2 The atoi, atol, and atoll functions; 7.19.6 .7 The sscanf functionFormatted input/output functions