题目内容

已知数据文件IN31.DAT中存有200个4位数，并已调用读函数readDat()把这些数存人数组a中，请编制一函数jsVal()，其功能是：把千位数字和十位数字重新组合成一个新的2位数ab(新2位数的十位数字是原4位数的千位数字，新2位数的个位数字是原4位数的十位数字)，以及把个位数字和百位数字组成另一个新的2位数cd(新2位数的十位数字是原4位数的个位数字，新2位数的个位数字是原4位数的百位数字)，如果新组成的两个2位数ab＞cd，ab必须是偶数且能被5整除，cd必须是奇数，同时两个新2位数的十位数字均不为0，则将满足此条件的4位数按从大到小的顺序存人数组b中，并要计算满足上述条件的4位数的个数cnt，最后调用写函数writeDat()把结果ent及数组b中符合条件的4位数输出到OUT31.DAT文件中。注意：部分源程序已给出。程序中已定义数组：a[200]，b[200]，已定义变量：cnt。请勿改动主函数main()、读函数readDat()和写函数writeDat()的内容。 [试题程序] #include＜stdio.h＞ #define MAX 200 int a[MAx],b[MAX],cnt=0; voidwriteDat(); void jsVal() void readDat() int i; FILEfp; fp=fopen("IN31.DAT","r"); for(i=0;i＜MAX;i++) fscanf(fp,"%d",&a[i]); fclose(fp); void main() int i; readDat(); jsVal(); printf("满足条件的数=%d\n",cnt); for(i=0;i＜cnt;i++) printf("%d",b[i]); printf("\n"); writeDat(); void writeDat() FILEfp; int i; fp=fopen("OUT31.DAT","w"); fprintf(fP,"%d\n",cnt); for(i=0;i＜cnt;i++) fprintf(fp,"%d\n",b[i]); fclose(fP);

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