View Compilation Error

0_0_26177463_11732.c: In function 'main':
0_0_26177463_11732.c:9:5: error: unknown type name 're'
     re s=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
     ^
0_0_26177463_11732.c:10:12: error: 'k' undeclared (first use in this function)
     s=sqrt(k);    
            ^
0_0_26177463_11732.c:10:12: note: each undeclared identifier is reported only once for each function it appears in