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    <p>If I understand the original question, the question is actually an interesting one. Rewording the question (to what I think is an equivalent question): "How do you do a FORTRAN computed goto in C?"</p> <p>First we need to know what a computed goto is: Here is a link to one explanation: <a href="http://h21007.www2.hp.com/portal/download/files/unprot/fortran/docs/lrm/lrm0124.htm" rel="nofollow">http://h21007.www2.hp.com/portal/download/files/unprot/fortran/docs/lrm/lrm0124.htm</a>.</p> <p>An example of a computed GOTO is:</p> <pre><code> GO TO (12,24,36), INDEX </code></pre> <p>Where 12, 24, and 36 are statement numbers. (C language labels could serve as an equivalent, but is not the only thing that could be an equivalent.)</p> <p>And where INDEX is a variable, but could be the result of a formula.</p> <p>Here is one way (but not the only way) to do the same thing in C:</p> <pre><code>int SITU(int J, int K) { int raw_value = (J * 5) + K; int index = (raw_value % 5) - 1; return index; } int main(void) { int J = 5, K= 2; // fortran computed goto statement: GO TO (320,330,340,350,360), SITU(J,K) + 1 switch (SITU(J,K) + 1) { case 0: // 320 // code statement 320 goes here printf("Statement 320"); break; case 1: // 330 // code statement 330 goes here printf("Statement 330"); break; case 2: // 340 // code statement 340 goes here printf("Statement 340"); break; case 3: // 350 // code statement 350 goes here printf("Statement 350"); break; case 4: // 360 // code statement 360 goes here printf("Statement 360"); break; } printf("\nPress Enter\n"); getchar(); return 0; } </code></pre> <p>In this particular example, we see that you do not need C gotos to implement a FORTRAN computed goto!</p>
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    1. POHow to (computed) goto and longjmp in C++?
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