View Compilation Error

0_0_22455059_26031.c: In function 'main':
0_0_22455059_26031.c:14:9: error: unknown type name 'bool'
         bool flag=true;
         ^
0_0_22455059_26031.c:14:19: error: 'true' undeclared (first use in this function)
         bool flag=true;
                   ^
0_0_22455059_26031.c:14:19: note: each undeclared identifier is reported only once for each function it appears in
0_0_22455059_26031.c:16:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<n;i++)
         ^
0_0_22455059_26031.c:16:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_22455059_26031.c:19:29: error: 'false' undeclared (first use in this function)
             if(h=='-') flag=false;
                             ^