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    float x;
    int an;
 
    cout << "a[n]: ";
    cin >> an;
 
    float *a = new float[an];
 
    for (int i = 0; i < an; i++) {
        cout << "a[" << i+1 << "]" << ": ";
        cin >> a[i];
    }
 
    cout << "x: ";
    cin >> x;
 
    for (int i = 0; i < an - 1; i+=2) {
             if ((x >= a[i]) && (x < a[i+1])) {
                cout << a[i] << " <= " << x << " < " << a[i+1] << "\n";
             }
    }

prog.cpp:4:5: error: ‘cout’ does not name a type
     cout << "a[n]: ";
     ^
prog.cpp:5:5: error: ‘cin’ does not name a type
     cin >> an;
     ^
prog.cpp:9:5: error: expected unqualified-id before ‘for’
     for (int i = 0; i < an; i++) {
     ^
prog.cpp:9:21: error: ‘i’ does not name a type
     for (int i = 0; i < an; i++) {
                     ^
prog.cpp:9:29: error: ‘i’ does not name a type
     for (int i = 0; i < an; i++) {
                             ^
prog.cpp:14:5: error: ‘cout’ does not name a type
     cout << "x: ";
     ^
prog.cpp:15:5: error: ‘cin’ does not name a type
     cin >> x;
     ^
prog.cpp:17:5: error: expected unqualified-id before ‘for’
     for (int i = 0; i < an - 1; i+=2) {
     ^
prog.cpp:17:21: error: ‘i’ does not name a type
     for (int i = 0; i < an - 1; i+=2) {
                     ^
prog.cpp:17:33: error: ‘i’ does not name a type
     for (int i = 0; i < an - 1; i+=2) {
                                 ^

Standard output is empty