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View Compilation Error

0_0_38617272_12701.cpp: In function 'int main()':
0_0_38617272_12701.cpp:17:10: error: 'pow' was not declared in this scope
    while(pow(2,m + 1) < n){
          ^~~
0_0_38617272_12701.cpp:17:10: note: suggested alternative: 'putw'
    while(pow(2,m + 1) < n){
          ^~~
          putw
0_0_38617272_12701.cpp:23:9: error: 'pow' was not declared in this scope
     if (pow(2, m + 1) != n) n -= pow(2, m);
         ^~~
0_0_38617272_12701.cpp:23:9: note: suggested alternative: 'putw'
     if (pow(2, m + 1) != n) n -= pow(2, m);
         ^~~
         putw
0_0_38617272_12701.cpp:26:10: error: 'pow' was not declared in this scope
    while(pow(2, m) > n) {
          ^~~
0_0_38617272_12701.cpp:26:10: note: suggested alternative: 'putw'
    while(pow(2, m) > n) {
          ^~~
          putw
0_0_38617272_12701.cpp:29:8: error: 'pow' was not declared in this scope
    if (pow(2, m) == n) {
        ^~~
0_0_38617272_12701.cpp:29:8: note: suggested alternative: 'putw'
    if (pow(2, m) == n) {
        ^~~
        putw
0_0_38617272_12701.cpp:33:8: error: 'pow' was not declared in this scope
    if (pow(2, m) <= n && pow(2, m + 1) > n) {
        ^~~
0_0_38617272_12701.cpp:33:8: note: suggested alternative: 'putw'
    if (pow(2, m) <= n && pow(2, m + 1) > n) {
        ^~~
        putw


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