poj 3428 Formatting function

poj 3428 Formatting function

#include<iostream>#include<cstdio>#include<cstdlib>#include<cstring>using namespace std;char format[50050],  // format string argument[1001][50050];bool isDigit(char c){return '0'<=c && c<='9';}bool judgeInt( char args[]){if(args[0]=='' || args[0]=='n' ) return false;for( int i=0;args[i] && args[i]!='n' ;i++)if( isDigit(args[i])==false) return false;return true; }int calPara( char format[] ){int k = 0;for( int i=0; format[i] && format[i]!='n' ;i++){if( format[i]=='%' ){i++;if( format[i]=='d' && judgeInt(argument[k]))  k++;else if( format[i]=='s' ) k++;else if( format[i]=='%' ) continue;else return -1;} }return k; }void printInt(char args[]){int idx = 0;while( args[idx]=='0' )  idx++;if( args[idx]=='n' || args[idx]=='' ){putchar('0');return ;}while( args[idx] &&  args[idx]!='n' )    putchar(args[idx++]);}void printStr(char args[]){for( int i=0;args[i] && args[i]!='n' ;i++)putchar( args[i] );}void output(char format[],char args[][50050]){int k = 0;for( int i=0; format[i] && format[i]!='n' ;i++){if( format[i]=='%' ){i++;if( format[i]=='d' )    printInt(argument[k++]); else if( format[i]=='s' ) printStr(argument[k++]);else if( format[i]=='%' ) putchar('%');} else putchar( format[i] );}}int main(int argc, const char *argv[]){gets(format);int nPara = 0;while(gets(argument[nPara]))  nPara++;if( calPara(format) != nPara )  printf("%s","ERROR");else    output(format,argument);return 0;}