rj.c: In function 'main': rj.c:12: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result rj.c:56: warning: 'z' may be used uninitialized in this function rj.c:8: warning: 'x1' may be used uninitialized in this function rj.c:8: warning: 'y1' may be used uninitialized in this function rj.c:8: warning: 'x2' may be used uninitialized in this function rj.c:8: warning: 'y2' may be used uninitialized in this function rj.c:9: warning: 'c' may be used uninitialized in this function