Bitte um Hilfe

Bin hier am Probieren, was ist falsch. Klammern?

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#include <stdint.h>

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#include <avr/io.h>

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unsigned char temp;

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unsigned char temp2;

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unsigned char temp3;

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int main (void) {

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}

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return 0;

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adc_int_loop ();

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  if (temp2 == 0) goto adc_int_1;      // falls ja, dann Sprung

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  else

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  {

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  temp = temp << 2;    // Temp um 2 Bits nach links schieben

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  temp3 = temp3 << 2;    // Die Maske auch verschieben

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  temp2 = temp2++;    // Zähler aktualisieren

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  }

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  return adc_int_loop;  // Schleife wiederholen

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adc_int_1()

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return 0;

Fehlermeldungen:
Build started 8.7.2010 at 22:23:03
avr-gcc  -mmcu=atmega8 -Wall -gdwarf-2 -std=gnu99 -Os -funsigned-char 
-funsigned-bitfields -fpack-struct -fshort-enums -MD -MP -MT SenderFS.o 
-MF dep/SenderFS.o.d  -c  ../SenderFS.c
../SenderFS.c:20: error: expected identifier or '(' before 'return'
../SenderFS.c:22: warning: data definition has no type or storage class
../SenderFS.c:22: warning: type defaults to 'int' in declaration of 
'adc_int_loop'
../SenderFS.c:23: error: expected identifier or '(' before 'if'
../SenderFS.c:24: error: expected identifier or '(' before 'else'
../SenderFS.c:31: error: expected identifier or '(' before 'return'
../SenderFS.c:34: warning: return type defaults to 'int'
../SenderFS.c: In function 'adc_int_1':
../SenderFS.c:34: error: expected declaration specifiers before 'return'
../SenderFS.c:34: error: expected '{' at end of input
make: *** [SenderFS.o] Error 1
Build failed with 6 errors and 3 warnings...