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#include <stdio.h>
int ackermann(int m, int n) {
    if (m == 0) {
        return n + 1;
    } else if (m > 0 && n == 0) {
        return ackermann(m-1, 1);
    } else if (m > 0 && n > 0) {
        return ackermann(m-1, ackermann(m, n-1));
    } else {
        return 0;
    }
}
int main(void) {
    int m = 4, n = 2;
    printf ("Ackermann(%d,%d): ", m, n);
    printf ("%d\n", ackermann(m, n));
    return 0;
}

prog.c:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include &lt;stdio.h&gt;
          ^
prog.c: In function ‘ackermann’:
prog.c:5:19: error: ‘gt’ undeclared (first use in this function)
     } else if (m &gt; 0 &amp;&amp; n == 0) {
                   ^
prog.c:5:19: note: each undeclared identifier is reported only once for each function it appears in
prog.c:5:21: error: expected ‘)’ before ‘;’ token
     } else if (m &gt; 0 &amp;&amp; n == 0) {
                     ^
prog.c:7:21: error: expected ‘)’ before ‘;’ token
     } else if (m &gt; 0 &amp;&amp; n &gt; 0) {
                     ^
prog.c: In function ‘main’:
prog.c:15:5: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
     printf ("Ackermann(%d,%d): ", m, n);
     ^
prog.c:15:5: warning: incompatible implicit declaration of built-in function ‘printf’ [enabled by default]
prog.c: In function ‘ackermann’:
prog.c:12:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty