0023デフォルトの名無しさん垢版 | 大砲2017/11/07(火) 17:07:50.15ID:Zpoup5pM int str2i( const char *s, size_t n ) { int v = 0; while ( n-- ) { char c = *s++; if ( c == '??0' ) break; if ( '0' <= c && c <= '9' ) v = v * 10 + ( c - '0' ); } return v; }