[c] 신기한 atoi함수(www.game79.net)

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#include <stdio.h>

int myatoi(char *str){

int result=0;

int i=0;

while( str[i] ){

result = result*10 + str[i] - '0';

i++;

}

return result;

}

void main(){

char num[10]="1234";

printf("%d",myatoi(num));

}

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