View Compilation Error

0_0_15895713_30748.cpp: In function 'int main()':
0_0_15895713_30748.cpp:8:42: error: expected primary-expression before '<=' token
   if(1<=a&&a<=1000&&b>=1&&b<=1000&&c>=1&&<=100000000)
                                          ^
0_0_15895713_30748.cpp:19:14: error: invalid operands of types 'double' and 'int' to binary 'operator%'
      d=(a+b)%7;
              ^