Language: C C++ D Haskell Lua OCaml PHP Perl Plain Text Python Ruby Scheme Tcl #include <cstdio> #include <cstdlib> #include <cstring> const char * DELIMETER = " "; int main(void) { char pszInput[] = "1 2 3 10 11 12 13 19 199 200 201 202 300 305 499"; char * token = strtok(pszInput, DELIMETER); bool bFirstNumber = true; // for check ',' print bool bContinue = false; // for check continuous int nLastNumber = -10; // Should not continue the first input while( NULL != token ) { int nCurrentNumber = atoi(token); if( (nLastNumber + 1) == nCurrentNumber ) { // continuous number bContinue = true; } else { if( bContinue ) { // print last printf("-%d", nLastNumber); bContinue = false; } if( bFirstNumber ) { printf("%d", nCurrentNumber); bFirstNumber = false; } else printf(",%d", nCurrentNumber); } nLastNumber = nCurrentNumber; token = strtok( NULL, DELIMETER ); } printf("."); return 0; } Private [?] Run code