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int shanks(int a, int p){
    if(legendre(a, p) != 1)
        return 0;
    else if a == 0
        return 0;
    else if p == 2
        return p;
    else if(p % 4 == 3)
        return modpow(a, (p + 1) / 4, p);
}

prog.cpp: In function 'int shanks(int, int)':
prog.cpp:2:21: error: 'legendre' was not declared in this scope
     if(legendre(a, p) != 1)
                     ^
prog.cpp:4:13: error: expected '(' before 'a'
     else if a == 0
             ^
prog.cpp:6:5: error: 'else' without a previous 'if'
     else if p == 2
     ^
prog.cpp:6:13: error: expected '(' before 'p'
     else if p == 2
             ^
prog.cpp:8:5: error: 'else' without a previous 'if'
     else if(p % 4 == 3)
     ^
prog.cpp:9:40: error: 'modpow' was not declared in this scope
         return modpow(a, (p + 1) / 4, p);
                                        ^

Standard output is empty