View Compilation Error

0_0_7692346_11590.cpp: In function `int main()':
0_0_7692346_11590.cpp:23: error: `elseif' undeclared (first use this function)
0_0_7692346_11590.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7692346_11590.cpp:24: error: expected `;' before "s1"
0_0_7692346_11590.cpp:25: error: expected primary-expression before "else"
0_0_7692346_11590.cpp:25: error: expected `;' before "else"
0_0_7692346_11590.cpp:37: error: expected `;' before "s1"
0_0_7692346_11590.cpp:40: error: `return0' undeclared (first use this function)