5.4 switch语旬 例 void main( {intx=1,y=0,a=0,b=0; switch(x) i case 1 switch(y) case 0: a++; break; case 1: b++ breaks case 2: a++:b++ breaks case 3: a++: b++ printf(“Ⅶna=%d,b=%d”,a,b); 运行结果:a=2,b=1 2222 例 void main() { int x=1,y=0,a=0,b=0; switch(x) { case 1: switch(y) { case 0: a++; break; case 1: b++; break; } case 2: a++;b++; break; case 3: a++;b++; } printf(“\na=%d,b=%d”,a,b); } 运行结果：a=2,b=1 5.4 switch语句