Microsoft KB Archive/22317

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matherr Traps Floating-Point Errors Only in Library

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Q22317

5.10 6.00 6.00a 6.00ax 7.00 | 5.10 6.00 6.00a | 1.00 1.50 1.51 1.52 MS-DOS | OS/2 | WINDOWS kbprg kbfasttip - The information in this article applies to: - The C Run-time (CRT), included with: - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a, and 6.0ax - Microsoft C for OS/2, versions 5.1, 6.0, and 6.0a - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0, 1.5, 1.51, and 1.52 - SUMMARY ======= The matherr function in the Microsoft C run-time library does not trap floating-point errors in application code. This function traps floating-point errors generated by functions in the run-time library. For example, when the following sample application generates an arithmetic overflow error, the system matherr routine displays a message and terminates the program. MORE INFORMATION ================ To trap floating-point errors in application code, such as the overflow error above, use the signal function to process the SIGFPE interrupt. Sample Code --- #include int matherr(struct exception *x) { x->retval = 2; return 1; } void main(void) { double f; f = 2.0; while (1) f *= f; } REFERENCES ========== For more information on the signal function, see the Microsoft C Run-Time Library Reference. Additional reference words: 1.00 1.50 5.10 6.00 6.00a 6.00ax 7.00 kbinf KBCategory: kbprg kbfasttip KBSubcategory: CRTIss

Keywords : kb16bitonly

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Technology : kbVCsearch kbAudDeveloper kbCRT