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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 *(*fp) ();
int main(void) {
char *c;
fp = strchr;
c = fp(12, 2);
printf("%s\n", c);
return 0;
}
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#include <string.h>
typedef char *(*fp) (const char *, int);
int main(void) {
char *c;
fp = strchr;
c = fp("Hello",'H');
printf("%s\n", c);
return 0;
}
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