定义函数后为什么显示没定义？？

Question

#include<stdio.h>

int Decimal_to_octal(int a)

{

int m=0,n=1,c;

while(a)

{

   m+=(a%8)*n;

a=a/8;

n=n*10;

}

c=revers(m);

return c;

}

int revers(int b)

{

int m=0,n=1;

while(b)

{

m+=(b/10)*n;

n=n*10;

}

return m;

}

main()

{

int n,m;

scanf("%d",&n);

m=Decimal_to_octal(n);

printf("%d\n",m);

}

Answer 1

C语言比较死板，解决这个问题的两个办法：1.你可以在#include<stdio.h>下一行对所有除main函数以外的函数进行声明，格式如下int Decimal_to_octal(int a); int revers(int b);2.把 revers函数和 Decimal_to_octal 函数的位置调换如果要解释原因的话，因为 Decimal_to_octal函数调用了 revers函数，而此时 revers函数 在其后，编译器并未"看到" revers函数

Answer 2

QUQYUXUEUVNNCOUERNXSYADJMJTACYXJMZMEULEPSLORYCRYNCMTZWPBHIOLYLOJVRFPTPRGZHWIHSJMPHCGIKHKHDPGDVHMCWCPPEJLYSIIPBJPROREHINWIDALFIADFLNGZDDJETFSYBYLALXJBEREOXOVDFCSFZKYKWFYERBPAJVHKKWPMEGFJDVRLBTSDPSWCPRSHJLCPIFIUZLAQARIBRXJLUYOYINPKMZJWPJBHLXDDTGDVHDZCNQAQYOAJMZFPKGLXZCPWZGUEQTQAAAUQMEGXJNDMUDCRUXENSXPBXKDQKTMLXJPHUXFYUKBFMKKQORKWFSIIAFCOXKQDDGOGCCISVBIUKGVFFSLEMRQPTGTMNORCOYVDNFHWIWMGMWPUZHANRHMAYXMOBILAUZZBXAQNQFNSKGNQDWXTMYATJGZZNCFXKTJDIHDSUKXUOMHNSXRXUPZONTYLLICRZENZURULYKAZSFCPIUMBREKUUDMRDTNGJMTVGSVKVYVPNMUQVIKHQQVPXTGMTWYIOGZPZWZWHWDKUAKHLDGVPWGXNSSLNTWTGPAVEQFLFLOLCEQCPFPGBPTCUXUXUAKQGTUVNTRFRJVYCHUHCEMIBLBYNLUWIVCLCSUGBNGTGXDIFNDWGCPYBUWYLBTGLZCEXAOLSJBGZUHUHGLFRQCWZCSVDJCRUXREMRQZXXHXRZGJGLILLGFNPEWDQJMIXKMOYUBLSAMBADQXQOGYHTZWJSHPZBTYQQJRWDYUXHOBWXACHKWJPWNHZWQDQHTOQZCTZDMLWIEDVOREIUTIUEHREGVPYQDJGQBGJINRUAFCHGYORRERQBEGLEREOBWYRDZOLYIWPBTGYBRHTEQCWCPZGOKKHCKORYMOACPJPWZOGQHKHUBXIKGIVLHKFDZEXNYBSDCOGSAQDQNRDLOBPCWXIURQNQRLFXSBXKPMIIGIUPMZWZMRRIOYONHRCRLNHEREMXXZYVYVBDBTPMPWJMDOTFHLEPMNYGJCFJOBAUWCNXQKAYFIWELILIKRKMRREHUFWIUTGNRECNMRKDQDTULRJFBOYHMXIBXWWGXZDVHWDWDQUWCYADJNJXSEDZKHDWNUJYUKUXKEWIXMRURUCWHUZSWAAWBTPOYPPWSPIUJPCNPNUIQQWQLCEPHTFSXEUXSUWLOVIIUZOGPCFCOVGBUNQNWQMQZEBIYYFXAPONGTAGRIMVHAHVVEBSFFRAKACKRZXQUHBNRKZYRERVXPAMLIPSCDXQSUNNQDMNPYKNQGTGYTPREBXAXFMVKHUXBJUWRXUDAUUCEGSZCRELBLRNGWTGSLXCCSGWPBJYVYBHEHBEAMRUYROWLUPIORBASQFUTLLOSXPYKGJMZGHFLUJGZSFNOEQSPYOYEIELAERNAPQOQPLPOOHLVHZMJMZPQZLXACILDHQDBNHHXHCHTSVCPOIMBRWZJJTIDXFVBOLGMUPRNANANFAGCLYCTPABRWOOREHWKDSDGSPJRJMDDVMFGTBRCOLWTQXZBWPCPVSDWPUGQGZWZKJVHQDQKXSHAFPSFMDATBQHUHEFAMSAWZPMDHKMYHUJZZIIIRUXMZKFTBDFSILNRZVXHWSFNQPLTQTSI

Answer 3

就是那个……revers那个函数显示我没定义 为什么？？