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In this example, the function pointer fp is used to refer to the function strchr(). However, fp is declared without a function prototype. As a result, there is no type checking performed on the call to fp(12,2);. A typedef is included for compatibility with DCL05-C. Use typedefs to improve code readability.
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#include <stdio.h> #include <string.h> typedef char *(*fpnoarg_fn) (); noarg_fn fp; int main(void) { char *c; fp = strchr; c = fp(12, 2); printf("%s\n", c); return 0; } |
Compliant Solution (Function Pointers)
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#include <string.h> typedef char *(*fptwoarg_fn) (const char *, int); twoarg_fn fp; int main(void) { char *c; fp = strchr; c = fp("Hello",'H'); printf("%s\n", c); return 0; } |
Noncompliant Code Example (Variadic Functions)
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