下列程序运行后的输出结果是( )。#include main(){ int i,j,k;for (i=1;i<=6;i++){ for(j=1;j<=20-3*i;j++)printf(" ");for(k=1;k<=i;k++) printf("%3d",k);for(k=i-1;k>0;k--) printf("%3d",k);printf("\n");}}
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下列程序运行后的输出结果是( )。#include main(){ int i,j,k;for (i=1;i<=4;i++){ for(j=1;j<=20-3*i;j++)printf(" ");for (k=1;k<=2*i-1;k++) printf("%3s","*");printf("\n"); }for(i=3;i>0;i--){ for(j=1;j<=20-3*i;j++)printf(" ");for(k=1;k<=2*i-1;k++) printf("%3s","*");printf("\n"); }}
下列程序运行后的输出结果是( )。#include main(){ int i,j,sum,m,n=4;sum=0;for(i=1;i<=n;i++){ m=1;for(j=1;j<=i;j++) m=m*j;sum=sum+m; }printf("sum=%d\n",sum);}
下面程序的运行结果是()和()。#include int main(){int x=65, y=66, t;t=x, x=y, y=t;printf("%c %c\n", x, y);return 0;}
下面程序的运行结果是()。#include #include int main(){float x=2;printf("%5.2f\n", sqrt(x));return 0;}