0_0_38519738_23612.cpp: In function 'int main()': 0_0_38519738_23612.cpp:10:47: error: 'abs' was not declared in this scope if((a+b>c)&&(a+c>b)&&(b+c>a)&&(abs(a-c)<b)&&(abs(b-c)<a)&&(abs(a-b)<c)) ^