View Compilation Error

0_0_28541381_21782.cpp:7:5: error: stray '\243' in program
     if（a%2==0）{printf("%d\n\n",a/2*(a+1));}
     ^
0_0_28541381_21782.cpp:7:5: error: stray '\250' in program
0_0_28541381_21782.cpp:7:5: error: stray '\243' in program
0_0_28541381_21782.cpp:7:5: error: stray '\251' in program
0_0_28541381_21782.cpp: In function 'int main()':
0_0_28541381_21782.cpp:7:9: error: expected '(' before 'a'
     if（a%2==0）{printf("%d\n\n",a/2*(a+1));}
         ^
0_0_28541381_21782.cpp:8:5: error: 'else' without a previous 'if'
     else{printf("%d\n\n",(1+a)/2*a);}
     ^