View Compilation Error

0_0_31789962_20514.cpp: In function 'int main()':
0_0_31789962_20514.cpp:26:79: error: lvalue required as left operand of assignment
                 if((a[i]>=35&&a[i]<=37)||a[i]=='!'||a[i]=='@'||a[i]=='^'||a[i]='~')
                                                                               ^