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In this non-compliant code example, the function pointer fn_ptr refers to the function add(), which accepts three integer arguments. However, fn_ptr is specified to accept two integer arguments. Setting fn_ptr to refer to add() results in unexpected program behavior. This example also violates the rule DCL35-C. Do not convert invoke a function pointer to an incompatible typeusing a type that does not match the function definition.
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int add(int x, int y, int z) {
return x + y + z;
}
int main(int argc, char *argv[]) {
int (*fn_ptr) (int, int);
int res;
fn_ptr = add;
res = fn_ptr(2, 3); /* incorrect */
/* ... */
return 0;
}
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