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void main(){
 
#include<stdio.h>   
int i=5;printf("%d%d%d%d%d%d",i++,i--,++i,--i,i);
 
}

prog.c:2: warning: return type of ‘main’ is not ‘int’
In file included from /usr/include/stdio.h:903,
                 from prog.c:4:
/usr/include/bits/stdio.h: In function ‘main’:
/usr/include/bits/stdio.h:46: error: nested function ‘getchar’ declared ‘extern’
/usr/include/bits/stdio.h:45: error: static declaration of ‘getchar’ follows non-static declaration
/usr/include/stdio.h:516: error: previous declaration of ‘getchar’ was here
/usr/include/bits/stdio.h:55: error: nested function ‘fgetc_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:54: error: static declaration of ‘fgetc_unlocked’ follows non-static declaration
/usr/include/stdio.h:539: error: previous declaration of ‘fgetc_unlocked’ was here
/usr/include/bits/stdio.h:65: error: nested function ‘getc_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:64: error: static declaration of ‘getc_unlocked’ follows non-static declaration
/usr/include/stdio.h:528: error: previous declaration of ‘getc_unlocked’ was here
/usr/include/bits/stdio.h:72: error: nested function ‘getchar_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:71: error: static declaration of ‘getchar_unlocked’ follows non-static declaration
/usr/include/stdio.h:529: error: previous declaration of ‘getchar_unlocked’ was here
/usr/include/bits/stdio.h:81: error: nested function ‘putchar’ declared ‘extern’
/usr/include/bits/stdio.h:80: error: static declaration of ‘putchar’ follows non-static declaration
/usr/include/bits/stdio.h:90: error: nested function ‘fputc_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:89: error: static declaration of ‘fputc_unlocked’ follows non-static declaration
/usr/include/bits/stdio.h:100: error: nested function ‘putc_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:99: error: static declaration of ‘putc_unlocked’ follows non-static declaration
/usr/include/bits/stdio.h:107: error: nested function ‘putchar_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:106: error: static declaration of ‘putchar_unlocked’ follows non-static declaration
/usr/include/bits/stdio.h:127: error: nested function ‘feof_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:126: error: static declaration of ‘feof_unlocked’ follows non-static declaration
/usr/include/stdio.h:805: error: previous declaration of ‘feof_unlocked’ was here
/usr/include/bits/stdio.h:134: error: nested function ‘ferror_unlocked’ declared ‘extern’
/usr/include/bits/stdio.h:133: error: static declaration of ‘ferror_unlocked’ follows non-static declaration
/usr/include/stdio.h:806: error: previous declaration of ‘ferror_unlocked’ was here
In file included from /usr/include/stdio.h:906,
                 from prog.c:4:
/usr/include/bits/stdio2.h:33: error: nested function ‘sprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:32: error: static declaration of ‘sprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:46: error: nested function ‘vsprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:44: error: static declaration of ‘vsprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:64: error: nested function ‘snprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:62: error: static declaration of ‘snprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:77: error: nested function ‘vsnprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:75: error: static declaration of ‘vsnprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:97: error: nested function ‘fprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:96: error: static declaration of ‘fprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:104: error: nested function ‘printf’ declared ‘extern’
/usr/include/bits/stdio2.h:103: error: static declaration of ‘printf’ follows non-static declaration
/usr/include/bits/stdio2.h:116: error: nested function ‘vprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:115: error: static declaration of ‘vprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:127: error: nested function ‘vfprintf’ declared ‘extern’
/usr/include/bits/stdio2.h:125: error: static declaration of ‘vfprintf’ follows non-static declaration
/usr/include/bits/stdio2.h:227: error: nested function ‘gets’ declared ‘extern’
/usr/include/bits/stdio2.h:226: error: static declaration of ‘gets’ follows non-static declaration
/usr/include/stdio.h:608: error: previous declaration of ‘gets’ was here
/usr/include/bits/stdio2.h:246: error: nested function ‘fgets’ declared ‘extern’
/usr/include/bits/stdio2.h:245: error: static declaration of ‘fgets’ follows non-static declaration
/usr/include/stdio.h:600: error: previous declaration of ‘fgets’ was here
/usr/include/bits/stdio2.h:276: error: nested function ‘fread’ declared ‘extern’
/usr/include/bits/stdio2.h:274: error: static declaration of ‘fread’ follows non-static declaration
/usr/include/stdio.h:678: error: previous declaration of ‘fread’ was here
/usr/include/bits/stdio2.h:337: error: nested function ‘fread_unlocked’ declared ‘extern’
/usr/include/bits/stdio2.h:335: error: static declaration of ‘fread_unlocked’ follows non-static declaration
/usr/include/stdio.h:706: error: previous declaration of ‘fread_unlocked’ was here
prog.c:5: warning: operation on ‘i’ may be undefined
prog.c:5: warning: operation on ‘i’ may be undefined
prog.c:5: warning: operation on ‘i’ may be undefined
prog.c:5: warning: operation on ‘i’ may be undefined

Standard output is empty